Bob is very solid guy. In my re-sell arsenal as well as in my personal system I use his products and pretty much I’d say I’m impressed by performance. I started diving on to his stuff when I decided to swap my Bryston 4bst amp for Sunfire SRA amp with absolutely same power, but SRA performance was way superior to Bryston that was nearly 3x more expensive.
Today downside of Carver equipment is service availability. After his retirement not many feel qualified to service these sophisticated pieces and they are not simple to examine and repair in case anything goes down south. I swap my carver amps in order to keep them running from time to time and see no issue with 40+ years old Carver equipment. It's indeed entirely underrated by Audiophile community