IDG Answers is a community of experts who are passionate about technology. Ask a question or answer one below.
It definitely still matters. Just because there are a lot of common components, that doesn't mean that they all are. I had an 32" RCA that I used for a laptop and gaming display in my home office. I paid something like $650 for it about three years ago, and it is currently sitting in a closet now because multiple things failed over time. The screen had issues first, then the power supply went belly up and it won't even turn on any longer. It would cost as much to fix it as to buy a new display at this point.
To echo Christoper's point, even if the same factory assembles device A and device B, that doesn't mean the specs for components are the same for both. Look at failure rates and you will see the difference. If I had the extra cash for a new display, I would probably get a Samsung. If I didn't, I would still save up for a while for a decent brand. I was burned by my relatively expensive (at the time) RCA, and I would rather spend extra than get another slab of junk.