Personally I wouldn't trust those TV's. My guess is they're "Walmart quality" if you know what I mean.
http://reviews.cnet.com/flat-panel-tvs/seiki-se50uy04-4k-uhd/4505-6482_7-35757100.html
The title says it all:
Cheap 4K TV has pixels aplenty, poor picture
Those features don't actually add to the cost of TV's any longer and haven't for the last 2-3 years.
Regardless of quality and cost, what's the point of buying a TV that has no content yet? AFAIK the best you can do right now are upscaling blu ray players. There's no content for them, MAYBE X1/PS4 will have 4k content but I'm not confident given their 1080p stuff on the current gen is just upscaled 720p so the jury is out on that one - all we know is that they have 4k output capability. Then of course cable TV can't even push out a 1080p signal yet, they're doing 1080i and 720p and probably will be for years. Eventually blu ray players and disks will come out and when they do, they'll probably cost a fortune. I remember when Blu/HD-DVD first came out, those disks were all full price for several years. I won't be buying into an early adopter format again when it means paying out the ass for content.
Edit:
I was hesitant to post this because last time I mentioned it in one of these threads on 4k, a lot of people that already bought the sets got pisses off and called me names. That said, here it is: buying 4k risks buying into the next 720p only to be replaced by 1080p. As someone that picked up a 720p TV in the early days of the 2000's, I'm in no hurry to repeat that mistake. 8k.
http://www.homecinemachoice.com/news/article/forget-ultra-hd-8k-is-closer-than-you-think/14385