I did use arvixe at one point. I like their company ethos, and they are an honest bunch of people. So I wouldn't say anything bad about them. They're organized and trying... Just google around a bit. In general though, if you have a problem, they'll get back to you fairly quickly. I also found the forum useful as a second way of contacting them. If you are worried about something, then visit the forum and post a thread. It usually gets picked up fairly quickly.
The head guy and founder, Arvan (I think), is pretty passionate about webhosting!