There are a LOT of negative posts about donhost on the forum.
However i have been using them for 6 months and despite a small problem at the beginning, i have found them perfectly good.
Uptime is excellent
The control panel is easy to use
A long as you dont get daniel, support is good and always fast
Also peoples main complaint that Donhost close accounts without warning has been changed, they have now changed their policy and if they find any files that should not be there they just delete the file, unless its warez or porn or something.
If you do decide not to go with donhost then maybe you should try:
Donhost are actually quite reliable but you have to realise although you get unlimited most things, you are limited on Bandwidth. So even if you want 100 accounts on your unlimited space, you have to divide your bandwidth by them all.
I think its around 12gb a month (may be wrong ) but it doesnt work out well for your customers