I have an account with them for about 8 months or so now. I have transfered my domain elsewhere and still thinking if I'm going to renew my accounts with them or not. I have mirrored NetBSD, FreeBSD, OpenBSD and MySQL on their server. The first time I did it, I found that all my files dissapeared for about 3 hours or so. I'm still keeping those mirrors and such. Not a bad experience from my side tho.
Oh, they disallow any forms of outgoing connections except on port 80 I think. You need to get a static IP with them for them to allow outgoing connections. I did get one and just to find out that they still block outgoing port 25 (which is what I needed to run my open relay test script).
Honestly, I'm not sure what to think about them. It's kind of reliable if you ask me, support's a bit bad though but that's just my 2 cents.