I didn't have this bag enough time to be able to form an impression on the durability of the materials used or the resilience of the zippers - all important aspects of a good sports bag.
In terms of design, functionality and ergonomics though it's a very well accomplished bag. The racket pockets are nicely padded and if you're not a high raking competition player carrying 8-10 rackets with him you will find yourself using the second racket pocket for something else - I do.
The side shoes pocket could be a tad bigger, especially if you have big feet :-) and the middle pocket is adequate if you're not carrying a LOT of stuff. The padded top "glasses" pocket is a great feature for the phone. I wished the bag had also a pair of hand carrying handles other then just the shoulder straps, but that's far from being a major inconvenient. All in all a very good all rounder sports bag that I wholeheartedly recommend.