During the summer, Thursday nights are free beofre 11pm and these are the only nights i would consider going. I don't think spending 13euro to get in can be justified in any way! Because there's no entrance fee on thursdays, these nights are going to be busy. Admidetly i have had one or two fun nights there, albeit, i probably would have had as much fun if i was in a field drinking with my friends...It's unlikely you'd get in wearing white runners, although i do recall seeing 'Pop idol' Simon Casey there once with his bright white adidas runners. He probably got in for free too!
Try to look neat and tidy, and you should have no problem.
