My experience is pretty limited, sadly, but I can't wait to go back, if that's any indicator of this place's coolness.
This bar is easy to miss, but this place is worth your time. We cruised in after checking out some other Cosmopolitan spots and grabbed a seat to listen to Kisses. Having other engagements, we couldn't stay long, but the vibe of the place was cool, the free admission was even better, and the intimate size of this bar/lounge makes for a great listening experience.
I didn't sample any drinks (having just had a few from the Chandelier Bar), so I can't comment there. I do wish Jim G. and I were going to be in Vegas in May so we could watch A Silent Film; if you're around, go check them out (May 9-12)!!