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Yeah, I think for all powermeters, service within warranty tend to be very good (Garmin excepted...). The thing is, they’re expensive products and the warranties tend to be short - does anyone offer more than two years? And, broadly they’re not very reliable, hence all the reported issues and “reports of great service”
The real question is what happens when problems arise outside the warranty period.
I had a Riken which died just before the 2 year warranty expired. Quarq replaced the spider with another Riken unit. That died 18 months later, but Quarq replaced it under warranty. Then it got stolen because @Cycliste left my rather nice road bike unlocked in a communal bike store in her block of flats for local enough for it to be nicked.
tl;dr they're not as reliable as P2M but the customer service is good.