I haven't noticed any issue with viewing the screen off-center. I have it up on the wall in the bedroom (side wall) with an articulating mount and view it from the bed at an obvious angle without any problem at all. It's hilarious to admit but it's probably the best overall TV I've ever owned and I've had some extremely expensive units. No, the blacks and contrast aren't the best ever. But for the price it's simply unbelievable. The menus are great and the system is extremely responsive. It's more responsive than my Apple TV, XBOX One X, or cable box. Very fluid and quick, which is so nice. Yes, the 55" has the 1/8 inch audio out. You could install a bluetooth transmitter (about $35 on Amazon) and use wireless bluetooth headphones with it if you like. It's identical to the smaller units, except it's even thinner. I wouldn't hesitate to purchase this, and for the price you could put one in every room.
The only complaint I've really seen that has any merit is the obvious inclusion of Amazon services. This is an Amazon Fire TV so if you're not in that ecosystem or don't want to be, I wouldn't get it. I have a lot of Echo devices, order from them practically daily, etc. so I'm embedded pretty well in all that and it works great (can use an Echo device to control it or the voice remote it comes with). Some people said there were ads and stuff for Amazon but I haven't seen that at all - I think they were misunderstanding what was being offered on the screen as far as subscribing to Starz, Acorn TV, etc. through the tv itself, which isn't required but is presented as an option when you select those channels. Nothing obtrusive at all about it, and if you do sign up for these (or are already subscribed) it integrates extremely beautifully, even creating a guide of sorts for all your channels. I know I sound like an idiot this tv but that's just how much I like it. Hope this helps!
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