If you're getting fenders, don't bother with those things - they're too small and have gaps in the coverage. QR on fenders is a total waste. Get a good, full-coverage fender like Planet Bike Freddy Fenders or SKS Chromoplastics. You should only use clip-ons if for some reason your bike can't equip full-coverage fenders. They're more secure, and they'll keep a lot more road gunk off of both you and your bike.