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Gone through many cheap and mid tier ones. I just enjoy first hand experiencing the differences in designs and materials. Currently rocking picrel. Its so-so ... the panniers are good but not very quick to release. The top bags ease and speed of attachement makes up for it. The top bag has plenty of space and acessibility, has shoulder straps if you want it to turn backpack. Material is more than decently waterproof, even the zippers.
My current suspicion is that the weak point in this set is a detail in its construction. Straps like the shoulder straps and the top handle are sewn in with seams in one pas. This is asking for trouble and tearing out, im literally waiting for it. On many products you'll find a construction that is doubled, with an extra patch that is 'welded' or glued on at high tension interfaces to provide needed strain relief.