I got the Cinema 50 installed and running last night. Initial impressions are good. I haven't dived too far yet beyond initial setup and listening at default settings though. Most important thing, sound quality seems great. I didn't pack the Anthem MRX 740 8K yet, so I had an opportunity to put the two receivers side by side and swap back and forth. I kept all EQ and positional settings default on both of them and just swapped my fronts back and forth manually (don't have a speaker switch). It was difficult to tell differences, but I thought the Cinema 50 sounded at least as good as the MRX 740 8K. I used three test songs that I knew fairly well and swapped back and forth at least five times. If anything, I felt like the Cinema 50 had a bit more clarity. Hard to say without of course getting into minutia of settings and such to try and even everything between the two.
I did run some atmos content and it sounded great. Very clear separation and detail, and objects sweeping between channels sounded natural. So processing seems accurate for my limited point of reference.
One thing that doesn't make sense to me about the Cinema 50. Why are there 11 speaker outputs when there's only 9 channels of amplification? I incorrectly assumed I'd be able to run a 7.2.4 system out of the box, but in fact I still need an external stereo power amp in order to do that.
Unit look and feel is nice. Front plate is plastic and remote is plastic, but everything still feels good. I didn't hear any fan noise yet. The relays inside make a rather loud clunk though, maybe that's a good thing to mean they're hefty?
Overall, Cinema 50 seems better deal than the MRX 740 8K. More channels, although slightly less power. $600 cheaper. Better user experience. Comparable sound quality, maybe a bit better.