Heat is probably the biggest issue with these amps. If you have a sealed room, it can get very warm in there. Cost of running Class A, compared to A/AB is is more expensive as well. Bass will be a bit tighter with Pass Labs Class A/AB amps. The number of XA160.8 listings isn’t really that high, many of them are multiples from the same person.
You should check out the number of Sold listings for Luxman M900u if you want to see a high number. A lot of these amps are resold within the first year of purchase - probably one of the biggest buyer remorse purchases I’ve noticed (if they’re selling them that quickly). Weak bass, and bright highs when pushed by any speaker that requires a good amount of power - good midrange though.
You should check out the number of Sold listings for Luxman M900u if you want to see a high number. A lot of these amps are resold within the first year of purchase - probably one of the biggest buyer remorse purchases I’ve noticed (if they’re selling them that quickly). Weak bass, and bright highs when pushed by any speaker that requires a good amount of power - good midrange though.