Can't say I'd ever be tempted to go back - I went once just for the novelty, because the décor is fun (I love En Masse's graffiti mural work and the big lego block bar is certainly original), plus the concept was initially interesting, but as one other reviewer wrote, "It gets old REAL fast." I have to wholeheartedly agree.
I didn't go for any slushie drinks because I'm too old for that crap (anybody over 18 is), so just sat and sipped a whiskey atop a stool with life-sized fishnet and high heeled legs (tacky, in my opinion). The experience was honestly quite flat. I finished my whiskey and left. There seemed to be a clutch of tittering young women in hairspray that were very familiar with the place and its bartenders, so I assume they frequent it. Not my crowd, friends, just not my crowd.
Still, it is almost worth going in to experience JUST once.