Seems that a few people have had problems with the ones from the groupbuy. Nathan is pretty much a one-man show, so when he gets a ton of orders he tries to crank them all out in a timely fashion.
I ordered mine before any groupbuy, and it's been doing fantastic. Installed it in feb. 05 and still works great, even with all the competitions and stereos i've put on it. Charges to AT LEAST 14.4v, more likely around 14.6-14.7.
It just sucks that the ones that fail get all the publicity, thus people make assumptions about the entire company. I know your situation sucks, but it'll be taken care of eventually. Hell, people used to complain every day about RE and their customer service, yet people keep buying from them. I've had 2 subs perform poorly, yet people still buy them.
It's all a matter of what gets posted and what doesn't. The bad stories always outweigh the good ones, even if there are hundreds of statisfied customers (which there is). 5 people post about a bad alt. and people assume the whole company is crap.