I've hardly had to use them. When I do I find them to be competent, friendly and efficient. I also feel like I am talking with a person rather than with someone who is tied to script. They also have the direct private support page attached to their forum on this site which is always nice if you have a question and don't want to pick up the phone.
There have been complaints about wait times but they are usually tied to September with students moving in and etc. The time 3 times I phoned in over several years the wait was under 30 seconds.