I've been using my 875 since about Feb this year when I moved home.
If you're looking for specifics about the phono stage, I'm afraid I can't help (No record player, you see.)
Otherwise, I can say i've had very little to complain about. Biggest issue I had was finding a unit that would allow it to breathe. I found a perfect unit in Ikea, and have had no issues with the heat at all. Only other problem I had was when the display died a month or so back, but the service was second to none. The came and collected it the very afternoon of the day I contacted them about the problem, and had it for about 10 days or so. It was returned in perfect working order and had been fine since.
Now. Performance wise, I can say I have nothing but praise for it. It's powerful and clear, and the surround steers very cleanly. (If you can accomodate 7.1, I'd recommend it. 7.1 is a bit weird at first. Coming from 5.1, my first impression was that there was less surround sound occuring, but I realised after a little while that it was because it was more immersive and didn't have that 'hole between the fronts and the surrounds.
All this was before I bought my Blu-Ray. Once I'd hooked up the Blu-Ray, my opinions were blown away yet again! HD Master-Audio is AMAZING!! I watched 'Master & Commander: Far Side of the World' last night. It's a particular fave of mine, and I've had it on DVD for years, so (usually) know what's coming!
When it's all quiet as 'Lucky Jim' spots the cannon flashes in the fog bank, the following cannonballs ripping into the Surprise scared the s**t out of me! My god! Talk about power!!
Took me about 5 minutes to get the grin off my face!
Right. I'll wrap this up. Yes. I'm a fan. I paid £1k and have no regrets. If you can get it for the new knock-down prices, I'd say jump on it. Newer stuff may have pushed the Onkyos out of the limelight, but i don't think you'll be disappointed in any way with an 875.