Thanks for starting this thread! I'll weigh in on my purchase too.
Just got it a couple days ago. I replaced an Onkyo TX-DS595, about 15 years old. Running a 5.1 system (Sierra 2 front/center/left, old PSB300s in back, 15" subwoofer Seaton Sound MFW-15 Turbo-SS). Hope to add a 65" OLED TV in January (LG OLED65B6p). It's a pretty typical 50/50 music/HT situation in a 15x15x8 room. I stream everything, no cable TV, and an over-the-air antenna (doubt I'll ever buy a physical media player again, that makes me a freak here, right?
I am not an audiophile, but I want the system to sound its best, so I'm trying to calibrate it with REW and a miniDSP UMIK-1 microphone. Part of the reason I bought the 7810 was that it can be calibrated down to 15.6Hz, which was new for even the Yamaha Aventage line in 2016 (I nearly bought an RX-A760 from A4L). Running YPAO was easy, but I'm hopeful REW will make it sound even better. But it is a bit of a learning curve, and I'm struggling with that.
--Sounds silly, but I really like the internet radio feature, and how you can create a set of presets of 100's of stations all over the world. And a button on the front makes it easy to switch to it (Net/TV/Radio). Wish there was a search feature in it though (it's just a bunch of station lists).
--With an HDMI cable and ARC, it was really easy to get the AVR and TV talking, so I can just use the simple TV remote to turn them both on/off and adjust the volume.
And it has a phono amp built in (yes I still play records)
--Airplay was easy to figure out too
I find the on-screen menus and the manual confusing for a novice. For example, there are a bunch of digital signal processing (DSP) modes that just get in the way (on the remote, on the front panel, in the interface). I just want to hear the sound as it was intended, do a lot of people really like the applied 'effects'?
My initial feeling is that the 7810 is overkill for my needs, but I think it's a nice mix of good price/good warranty/Yamaha reliability/good features. I can play my old records, I can add 2-channel Atmos later or a second zone in another room or wireless speakers if I get the itch. Problem is, I think I will struggle to use it to its full potential, and will have to spend a long time 'exploring' it. But I doubt I'll return it.
Hope this helps someone