I believe they have been the most reliable provider I've personally used! I have been so satisfied that I just renewed for a second year and that almost never happens with me because I find better deals between sign up and renewal. I've only had a few support requests and they have always answered them within minutes.
Every month I get my independent site monitoring emails to report overall uptime and it has never been under 98%, I actually think that it is typically 99.xx%
Finally, theirs is also the only VPS I currently have that hasn't been rebooted since I set it up...
I highly recommend trying them, I know I've been very satisfied.