I just signed up for the mid-range package a week ago - so far so good. unlimited extra domains is nice - their control panel is ok but it times out too quickly. They also seem to have a caching problem some days which can make designing your pages on the fly a pain in the ass. Their customer support though is excellent. One last complaint - their software addons are very easy to add to your top domain, but can't be added on the fly for any extra or subdomains. Without shell access ftp'ing entire cms's can be a pain and real time waster.
Hope that helps!