I used to run two of these at work cutting molds for vacuum forming. they are great when they are operating correctly. How do you plan to use them? My company was doing a LOT of routing so the wear and tear was pretty heavy. We'd run 6-7 hours at a time.
K2 was always awesome with service though. I can't say any of the problems we had were from design flaws...just a lot of use. However, this is not a 50k haas machine.