Never played. What's the appeal?
No need to table select, no waiting lists, no table breaking up, sitout at any time if you want to review a hand/take a piss, ...
And volume wise, playing 4 tables of rush gives you about as many hands/hour as 12 normal tables. But it's easier to focus on 4 tiled rush tables than on 12 normal tables that you can't really tile properly.
The problem is that all the regs like the convenience of rush, so the games are tougher than the normal tables for the same stakes.