I have passed through this airport about 20 times in the past few years I use Economy hence don't get the privilege of accessing the Premium Terminal. Transfer lines just to scan your bag can take up to 45 minutes. The transfer section needs to be thought through given the expansion of Qatar Airways. Staff are either friendly and clueless or just unfriendly. Toilets are disgusting. Very limited food and duty-free options. I'm glad that a new airport is coming up as this airport does not too Qatar Airways' reputation any justice.