Some commercial displays are tuned for bright, static, signage, which would naturally make poor video displays. However, I suspect that their actual display technology is usually identical to the consumer versions. Certainly the panels themselves come from the same factory.
But for what it is worth, my NEC commercial display doesn't look as good as a 4K display, naturally. It isn't a great monitor for text. I can't imagine how you could make 1080p at 55" look great at only arm's length away, though. That's just too much real estate to fill with too few dots.
But it's more than sufficient, and I greatly enjoy gaming and the occasional movie on it. It looks much better than the 42" off-brand it replaced, but not as good as the 32" Samsung in the other room. I'd buy again and recommend them. I'm certainly a big fan of them having a simple remote and a serial port with a well-documented control protocol.
The biggest problem with NEC and commercial displays in general is that you aren't really going to be able to do any pre-sales checks. They're not going to have an NEC hanging on the wall at Best Buy to compare. So all you have to go on is people like me who took the chance and offer up terribly unprofessional reviews, that might be pretty deeply contaminated with self-justification.
