I only know my own experience, and so far, so good. Twice emailed them with questions and they very promptly replied with exactly the info I needed.
I'd love to see some links to the reviews so that I know what to watch for, if it involves the bcg.
an OK review: red x arms??? - AR15.Com Archive
Decent review: RED X ARMS - AR15.COM
BBB "F" rating: Red X Arms Business Review in Starbuck, MN - Minnesota and North Dakota BBB
bad review: Jam live round with spent shell ???? - AR15 Armory.com
bad review of the company: http://www.ar15armory.com/forums/index.php?s=&showtopic=123644&view=findpost&p=2050097
I can't find the one that made me stay away, but I am leery of them.