Well, I'm very happy with my PS service. I mostly have it to insulate myself against other users on my server. I have a few small dynamic personal websites and don't require anything more than the bare minimum PS allotment.
Other than the systemwide outages and scheduled downtime, I haven't had any downtime related to my server or the PS service in general. It did take about 8 hours for my account and sites to be switched over to my new PS server. I think DH support says that it can take a day or two to transition everything over, but they did the transition very quickly in my case.
One thing you should be careful of is that if your sites are memory intensive, you may need a much higher level of service that could get kinda expensive. Of course, everything is relative to your own business or personal financial resources.
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