My Wise broke down a year after I bought it. One of the sensors that tells it's reached the end of the track, did not work. When I sent it in for service, they fixed the problem, and made up some excuse to void the rest of my warranty. Saying it was tampered.
Yes it does break down, but maybe once in a lifetime of the machine. I've only heard a few people with the similar problem.
Calibration should be done an authorized servicer.
The Wise 2086 Pro is a good upgrade, in fact, it's probably the only upgrade to a crank machine. There are a few others, but they are not offered anymore or probably cost just as much. If you plan on spending more, you are better off buying a high end machine.