They pretty much beat sus hands down for dj/street/park.
They always feel the same riding up a transition, like spongebomb said, you dont want to hit something, or pull up to hop and have your preload or rebound play about and send you funny.
On the note of being smooth, im a hack, and get away fine with rigid forks, just like riding a bmx, just more comfy.
And try to use steel bars, alu bars are too stiff and generally dont feel nearly as nice with rigids.
that's also the reason i don't ride freecoaster btw
i don't agree on the alu/steel bars, i rode rigid + alu bar for over a year without any problems. there was a thread on ride-steeze.com about this and nobody who've ridden that setup had any problems with it
Im not saying i really had any problems, it may just be i was used to steel bars, then switching to alu for a few months to try a lower/wider bar, was just a bit weird, which got sorted as soon as i went back to a steel bar