I've only had the 46" version for a short while - but here are my thoughts (so far):
Panel is probably a Chi Mei Innolux - PSA or maybe MVA? It's quite a good picture, but not eye-poppingly outstanding. It doesn't behave like a Samsung panel or have a Samsung SPVA model number.
There's no clouding, hot corners or bleed - a very even picture - but black levels are average - on dark films in a dark room the blacks behave like an 2010 CCFL LCD TV or Panasonic LED - slightly grey.
TV itself is very lightweight (lightest Sony I've ever owned). Stand appears to aluminium but feels more like plastic. Stand fixes to TV with two screws, but is quite tight. Back of TV is made of lightweight plastic. Sony logo is just printed on, not embossed. It's still classed as a Bravia, but the picture processing chip is not by Sony or X-Reality branded (it's an off-the-shelf MediaTek SOC design).
Remote control is very simple but well built and functions well, although not as solid as 2011 Sony TVs controls.
Sound quality is outstanding - much better than 2011/12 Sony TVs, much more like "classic" CRT TV sound.
Functions are basic but provide enough scope for average adjustments. Plays a lot of USB formats and recognises things quickly.
Menu system is more like 2010 Bravias than anything from 2011 onwards. Simple and straightforward but no flashy graphics. Does still match other Sony equipment, though.
Picture quality on broadcast TV is very good, no motion blur (didn't notice any), good colours but slightly low black levels.
Viewing angles are poor if you stand up but average from side to side (contrast washout and blacks become very blue, artefacting visible).
This is a budget TV and performs well for the price. I think it would do well for an average TV viewer. Movie buffs might be disappointed with the acceptable but not astounding blacks. Sound quality stands out as does ease of use, panel uniformity and simplicity. Worst parts are viewing angles and blacks.
I'm also going to try a Toshiba WL863 (direct LED/local dimming with AUO MVA panel) in a few days and will see which is better.