Future Hosting at http://futurehosting.biz
But I've had VPS's on three different physical servers with them and they were all starved for disk IO. They take quad core servers with 16-32GB of RAM but only put two 7200 RPM IDE drives in them. A 7200 RPM IDE drive is good for about 120 I/Os per second, so if the server has 20 users you get a whopping 6 I/Os per second.
Check it out:
$ time ls -l /etc /dev/null
real 0m12.530s user 0m0.004s sys 0m0.046s
12.5 seconds to list a directory with ~150 files. This is from a VPS account I have with them with nothing running on it.
To be fair, most VPS hosting probably sucks just as bad.
Good guys though.