well, I have cpanel on my main site and have moved about 40 some odd sites here to dreamhost in the last two years. I do plan to move my main site over here (it expires in less than 15 days...so I will probably do it this weekend, just the thought of it being down scares me.)
I (mostly) like the way the panel works in dreamhost. I like its integration with the ease of granting permissions of other webids to my main webid. I like the way that portion looks and works. I technically don't see the slow speed. To get stats on my site that has cpanel, I find I need to get up, log on to cpanel, go make coffee, let the animals out, etc...then come back and sometimes it's still not up.
I will have to admit that it took a bit of fuss to find which web browsers works best with dreamhost's webadmin panel. found that in ie, os9 mac I needed to use mozilla cause ie just doesn't work. On OSX, I like Camino and Firefox...but haven't really delved into all the OSX browsers yet. On windows, I just gave up logging onto the internet...too much time wasted making sure AV software was up to date and working and downloadig all those microsoft updates!
All in all, I like dreamhosts webadmin panel and see new things cropping up weekly (yeahhh, they finally changed the rewards section...now I can see things so much clearer — as I use that area to see when clients signed up, etc.)
well, just my opinion. it did take a bit to get used to and I will admit I didn't like it in the beginning.