I own the PowerSpec 3D Pro. It works as well as it does with any other printer. I use it for most of my slicing (the one caveat being the thin wall stuff http://forum.simplify3d.com/viewtopic.php?f=23&t=1838). But that's true for S3D with any printer.
Same here. It's a shame that I can't use S3D for everything, but... this one point makes me have to use Makerware on occasion. Not looking out for it enough, I usually don't catch it until the 4 or 5th layer of actual printing...