Planning to move to Site5 this month, but since the last 6 months had no problems with using the hostgator reseller account.
1and1 is what I use other then the mad slow interface, I have seen no unexpected down time. But be careful when you look at buying domains because you can't transfer them for 2 months.
Stay away from that banana garden of freaks. too busy to do their job, fu*ed-up billing, retarded support etc. Take something smaller and humane like Uberhost for example. In fact - they don't sleep at all (I don't know how they do it) - California based good old american service.HostGator is actually a total nightmare.
If you use HostGator and don't have any problems, you're likely not checking your websites very often
Obviously not BlueHost...
Seems like every Saturday morning around 10 for me, they take the servers down for up to 3 hours.
Cue Webferret dissing hostgator in 5...4...3...2...
if you use hostgator, and you are happy with their service, you must be on their 'baby croc of shit' $1 a month package, and your site gets like 3 page views a month. Everyone else is pulling their fucking hair out and trying to get hostgator to stop billing their credit cards illegally. Worst host *in the world*