Onyx Boox Tab X review – E-Ink tablet for big tasks?

Onyx Boox Tab Ultra C Pro
Qualcomm Snapdragon 855, Adreno 640, 6144 Average of class Tablet
  (140 – 1892, n=65, last 2 years) Huawei MatePad Paper
HiSilicon Kirin 820e, Mali-G57 MP6, 4096 Onyx Boox TabX
Qualcomm Snapdragon 662, Adreno 610, 6144 Average Qualcomm Snapdragon 662
  (275 – 316, n=13) Lenovo Smart Paper
Rockchip RK3566, Mali-G52 MP2, 4096 Average of class Tablet
  (312 – 8524, n=65, last 2 years) Onyx Boox Tab Ultra C Pro
Qualcomm Snapdragon 855, Adreno 640, 6144 Huawei MatePad Paper
HiSilicon Kirin 820e, Mali-G57 MP6, 4096 Average Qualcomm Snapdragon 662
  (763 – 1453, n=13) Onyx Boox TabX
Qualcomm Snapdragon 662, Adreno 610, 6144 Lenovo Smart Paper
Rockchip RK3566, Mali-G52 MP2, 4096

Onyx Boox Tab Ultra C Pro
Qualcomm Snapdragon 855, Adreno 640, 6144 Huawei MatePad Paper
HiSilicon Kirin 820e, Mali-G57 MP6, 4096 Average of class Tablet
  (567 – 14235, n=46, last 2 years) Average Qualcomm Snapdragon 662
  (1106 – 1905, n=12) Onyx Boox TabX
Qualcomm Snapdragon 662, Adreno 610, 6144 Lenovo Smart Paper
Rockchip RK3566, Mali-G52 MP2, 4096 Onyx Boox Tab Ultra C Pro
Qualcomm Snapdragon 855, Adreno 640, 6144 Huawei MatePad Paper
HiSilicon Kirin 820e, Mali-G57 MP6, 4096 Average of class Tablet
  (517 – 24605, n=46, last 2 years) Average Qualcomm Snapdragon 662
  (974 – 1074, n=12) Onyx Boox TabX
Qualcomm Snapdragon 662, Adreno 610, 6144 Lenovo Smart Paper
Rockchip RK3566, Mali-G52 MP2, 4096 Onyx Boox Tab Ultra C Pro
Qualcomm Snapdragon 855, Adreno 640, 6144 Average of class Tablet
  (858 – 5751, n=46, last 2 years) Average Qualcomm Snapdragon 662
  (2108 – 2513, n=12) Huawei MatePad Paper
HiSilicon Kirin 820e, Mali-G57 MP6, 4096 Onyx Boox TabX
Qualcomm Snapdragon 662, Adreno 610, 6144 Lenovo Smart Paper
Rockchip RK3566, Mali-G52 MP2, 4096 Onyx Boox Tab Ultra C Pro
Qualcomm Snapdragon 855, Adreno 640, 6144 Huawei MatePad Paper
HiSilicon Kirin 820e, Mali-G57 MP6, 4096 Average of class Tablet
  (267 – 14235, n=57, last 2 years) Onyx Boox TabX
Qualcomm Snapdragon 662, Adreno 610, 6144 Average Qualcomm Snapdragon 662
  (740 – 1197, n=12) Lenovo Smart Paper
Rockchip RK3566, Mali-G52 MP2, 4096 Onyx Boox Tab Ultra C Pro
Qualcomm Snapdragon 855, Adreno 640, 6144 Huawei MatePad Paper
HiSilicon Kirin 820e, Mali-G57 MP6, 4096 Average of class Tablet
  (240 – 24605, n=57, last 2 years) Onyx Boox TabX
Qualcomm Snapdragon 662, Adreno 610, 6144 Average Qualcomm Snapdragon 662
  (642 – 1081, n=12) Lenovo Smart Paper
Rockchip RK3566, Mali-G52 MP2, 4096 Onyx Boox Tab Ultra C Pro
Qualcomm Snapdragon 855, Adreno 640, 6144 Huawei MatePad Paper
HiSilicon Kirin 820e, Mali-G57 MP6, 4096 Average of class Tablet
  (441 – 5751, n=57, last 2 years) Average Qualcomm Snapdragon 662
  (1588 – 2534, n=12) Onyx Boox TabX
Qualcomm Snapdragon 662, Adreno 610, 6144 Lenovo Smart Paper
Rockchip RK3566, Mali-G52 MP2, 4096 Onyx Boox Tab Ultra C Pro
Qualcomm Snapdragon 855, Adreno 640, 6144 Average of class Tablet
  (286 – 10018, n=58, last 2 years) Huawei MatePad Paper
HiSilicon Kirin 820e, Mali-G57 MP6, 4096 Average Qualcomm Snapdragon 662
  (369 – 391, n=11) Onyx Boox TabX
Qualcomm Snapdragon 662, Adreno 610, 6144 Lenovo Smart Paper
Rockchip RK3566, Mali-G52 MP2, 4096 Average of class Tablet
  (289 – 25317, n=64, last 2 years) Onyx Boox Tab Ultra C Pro
Qualcomm Snapdragon 855, Adreno 640, 6144 Huawei MatePad Paper
HiSilicon Kirin 820e, Mali-G57 MP6, 4096 Average Qualcomm Snapdragon 662
  (366 – 382, n=8) Onyx Boox TabX
Qualcomm Snapdragon 662, Adreno 610, 6144 Lenovo Smart Paper
Rockchip RK3566, Mali-G52 MP2, 4096 Average of class Tablet
  (75 – 6919, n=64, last 2 years) Onyx Boox Tab Ultra C Pro
Qualcomm Snapdragon 855, Adreno 640, 6144 Huawei MatePad Paper
HiSilicon Kirin 820e, Mali-G57 MP6, 4096 Onyx Boox TabX
Qualcomm Snapdragon 662, Adreno 610, 6144 Average Qualcomm Snapdragon 662
  (102 – 111, n=5) Lenovo Smart Paper
Rockchip RK3566, Mali-G52 MP2, 4096 Average of class Tablet
  (72 – 6909, n=63, last 2 years) Onyx Boox Tab Ultra C Pro
Qualcomm Snapdragon 855, Adreno 640, 6144 Huawei MatePad Paper
HiSilicon Kirin 820e, Mali-G57 MP6, 4096 Average Qualcomm Snapdragon 662
  (100 – 107, n=4) Onyx Boox TabX
Qualcomm Snapdragon 662, Adreno 610, 6144 Lenovo Smart Paper
Rockchip RK3566, Mali-G52 MP2, 4096

Average of class Tablet
  (3 – 111, n=67, last 2 years) Huawei MatePad Paper
HiSilicon Kirin 820e, Mali-G57 MP6, 4096 Onyx Boox Tab Ultra C Pro
Qualcomm Snapdragon 855, Adreno 640, 6144 Average Qualcomm Snapdragon 662
  (4.8 – 15, n=13) Onyx Boox TabX
Qualcomm Snapdragon 662, Adreno 610, 6144 Lenovo Smart Paper
Rockchip RK3566, Mali-G52 MP2, 4096 Average of class Tablet
  (2.5 – 279, n=67, last 2 years) Onyx Boox Tab Ultra C Pro
Qualcomm Snapdragon 855, Adreno 640, 6144 Huawei MatePad Paper
HiSilicon Kirin 820e, Mali-G57 MP6, 4096 Onyx Boox TabX
Qualcomm Snapdragon 662, Adreno 610, 6144 Average Qualcomm Snapdragon 662
  (7.4 – 8.6, n=13) Lenovo Smart Paper
Rockchip RK3566, Mali-G52 MP2, 4096 Average of class Tablet
  (1.9 – 97.3, n=67, last 2 years) Huawei MatePad Paper
HiSilicon Kirin 820e, Mali-G57 MP6, 4096 Onyx Boox Tab Ultra C Pro
Qualcomm Snapdragon 855, Adreno 640, 6144 Average Qualcomm Snapdragon 662
  (2.9 – 9.6, n=13) Onyx Boox TabX
Qualcomm Snapdragon 662, Adreno 610, 6144 Lenovo Smart Paper
Rockchip RK3566, Mali-G52 MP2, 4096 Average of class Tablet
  (0.9 – 90, n=67, last 2 years) Onyx Boox Tab Ultra C Pro
Qualcomm Snapdragon 855, Adreno 640, 6144 Huawei MatePad Paper
HiSilicon Kirin 820e, Mali-G57 MP6, 4096 Onyx Boox TabX
Qualcomm Snapdragon 662, Adreno 610, 6144 Average Qualcomm Snapdragon 662
  (2.5 – 2.9, n=13) Lenovo Smart Paper
Rockchip RK3566, Mali-G52 MP2, 4096 Onyx Boox Tab Ultra C Pro
Qualcomm Snapdragon 855, Adreno 640, 6144 Average of class Tablet
  (0.4 – 48, n=60, last 2 years) Huawei MatePad Paper
HiSilicon Kirin 820e, Mali-G57 MP6, 4096 Onyx Boox TabX
Qualcomm Snapdragon 662, Adreno 610, 6144 Average Qualcomm Snapdragon 662
  (1.1 – 1.2, n=3) Lenovo Smart Paper
Rockchip RK3566, Mali-G52 MP2, 4096