Hi, I bought a brand new KICKR 6 months ago and can give some insight.
1: Its a great bit of kit. Not regretted it one bit.
2: After 3 months it started making a real racket. I phoned company and they were fab to deal with. Replaced the unit.
3: Spoke to a mechanic at Majorca 70.3 who used to work for Wahoo. Told me this was not uncommon.
So I wouldn’t be embarrassed to take my bike along rack it a try it out before you part with any cash.