I can't really give you that much feedback, but what I know I'll provide...
I've been on Dreamhost PS since August. You should know that it's not a true VPS and is more like a hybrid managed hosting + VPS. You don't get root but you do get shell access and you do get all the managed hosting features of a shared account like a nice panel, the one-click installs, etc.
I've only changed my CPU and memory once and it wasn't by much. It worked but now I've switched back to the original level. (I guess that means that I've actually switched twice) I'm guessing that you're wondering about big changes in CPU and memory limits that might affect your ability to be on a particular server. Unfortunately, I don't have much experience with that.
Uptime has been fine. It's improved significantly in that I don't run into the "busy server" problem from having a runaway neighbor, I'm still affected by DNS issues. With the DNS issues I at least know that I don't have to do too much checking up on my notification logs because DreamHost is always right on top of those kinds of systemwide problems.
The price is right to me - even though I imagine that there are competitors in the space, I haven't found one that matches ease of use if you don't want to have to manage everything yourself and the steadiness and dedicated resources available on Dreamhost PS.
Apologies if this sounds too one-sided or if it reads like ad copy, but I'm pretty happy. The one area for improvement is better handling of DNS or anything that would prevent or mitgate against the switch failure from earlier this autumn.
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