It's okay nothing really special about it I think. Just go with a bunch of friends and have fun! There are quite a plethora of rooftop bars around bkk, above 11 is middleish, definitely not the top. 35th floor is average in bkk.
Central worlds (Siam BTS or chidlom train stop) rooftop bar above the hotel and offices is quite nice on the 56th floor. Any questions feel free to pm me