It seems to me that, because they are so new, there isn't a lot of information on them, either here or on the web. I have a feeling that they will soon peak a lot more interest, and when that happens, I'm sure they will raise up their prices. Their current pricing is really good, IMO.
I was looking to get the upper with the YHM flip up sight mount. I like the ones with the full length rail [that covers the gas block], but with that model, I would have the extra cost of a flip up front site as well, not just a flip up rear site. I plan on running a scope on a quick detach rail, but like having backup sites.
As I said, these guys aren't well known, but I think I will take the risk of going with them. I like what you have posted about yours, as far as how it runs, and its accuracy. I hope mine will be equally impressive to me.
Thanks for your input.