Nick,
Don't fret. I've owned lots of Yamaha electronics over the years, which were generally excellent, including some of the very early "Digital Soundfield Processors". Plus Yamaha seems to have first-rate quality control. I've never had a test unit or any of the Yamaha gear I own ever fail, not once in 25 years.
I got annoyed with Yamaha AV units some years ago because they misbehaved with lower-impedance loads like the 4-ohm M80s. Apparently that's not true of recent Yamaha units.
I also had a usability bias because Yamaha used to hide secondary controls behind a flip-down panel on their up-market AV receivers. To access those controls was really annoying: they were tiny, hard to see, let alone read the labels. Now of course most of us use a remote control much of the time, but I sometimes like to operate stuff from the front panel. . .blah, blah, and so on. . .
Regards,
