I've been on Underhost for a few months now..the last couple weeks the site has gone down several times, each time Underhost has responded to me within a few minutes and gets the site back up right away. Yes, they guarantee uptime but when you are on an offshore server I suppose it's expected that people will do things that overload the servers and end up wrecking everyone's deal.
I hate it, but I accept it.
With that said I'm very impressed with Underhost and how quickly they have helped when I've had a problem either because of something I did (blacklisting myself when I forgot my password) or something someone else did.
And P.S.... I'm writing this while my site is down..ha!
http://aviationcriminal.com