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I have had my K3 for almost 6-years and have had zero problems. Total DX QSO's are 7,215 of which 6,976 were CW Didn't keep track of USA contacts, which included numerous net operations.
A K2 was purchased as a kit 15-years ago, and after having some original wiring issues (my fault) has worked flawlessly. It is currently operated every few weeks for several hours; didn't keep records number of its QSOs.
Before the K2 the rig was a Yaesu FT-1000D (now, 25 years old) - four times it has been repaired, the first time when it was 10-years old (2-times RF output issue & 2-times receiver problems. The Yaesu was/is used primarily on 160-meters (dedicated station) with an amplifier...it is also operated a few hours every month or so.
Regards, 73 - W7QHE