The clearest long-term account is a good one. After three years of heavy academic use, one owner reports no hardware or software faults. Another owner who has gone through many Boox devices, including the related Tab Ultra C Pro, says only a different model ever broke on them. The performance gripes in these accounts are about how apps feel, not about things failing.
The long-term evidence for this exact tablet is thin. Only one account follows the Tab Ultra C itself over several years, and the cracked-edge story in the durability sample is about a different brand of reader, not this one. Because no breakages are described for the Tab Ultra C, there is nothing yet on what owners do when something goes wrong.