I'd like to say you get what you pay for, but I'm not so sure:
Shoei Helmets - tend to replace these after a few years regardless, but if I don't get 30K+ out of them I'm tinkled off. Currently have a BMW one which is two years and 15K.
Frank Thomas Leather Jacket - Donkeys years now 100K plus miles and almost as good as the day I bought it
Weiss two piece waterproof - must be 12 years old now and still does its job perfectly.
HG intermediate gloves - Gortex. Very comfy, but were never more that shower proof
Sidi summer gloves - one layer of the outer leather came off very quickly as they are just not very robust and expensive
BMW winter Gloves - 15 years

Stitchning just roted away in the end

My current set (also BMW) 2 years so far.
Rev-it suit. Waterproof trouser liner fell to pieces; replaced FOC. Stitching frayed; repaired FOC. Waterproof trousers aren't because of a design flaw. But new liner yet to be tested in earnest! Would I buy them again? No, HG much better value