The server(s) we had cost a lot, but knowing you could connect with someone competent 24/7 was amazing.
Then... a few months later... we had to use it, and it was good, but they were about 2 minutes away from wiping our main drive. We'd requested a new beefier server and requested either the drive be moved or everything copied over to the new server.
Got a message new server was up - great. Logged in - nothing. Connect to old server? Nope - offline/disconnected. Ugh. Calling in got me a live person, and I stressed the urgency. We did get connected with someone, and they did find the right person, who was about to wipe the previous server. Crisis averted, but... immediately I start asking why the support ticket showed all requests as 'done' when... they weren't.
We stayed a while longer, but it felt like they were growing too quickly even then to keep the 'fanatical support' model that initially attracted us. FWIW, I had a couple of dedicated servers at a small place in NH, and they were... $70-$80/month on average. The rackspace servers typically started at $500/month. I think we were paying about $1800/month for the setup in question at the time of the crisis. My belief in 'you get what you pay for' was impacted that day.
I had another client years later (2010? 2012?) that used them and it felt like a completely different beast, far more generic and commodity like every other competitor, and I've never since looked at them again.