I use mine, but it's not for everyone. I have the backroller classic panniers, and I positioned the mounting clips slightly to the rear of center on the QL system rail so my heels don't hit the bags while pedaling. This means if I want the pannier centered on the backpack, I have to readjust the position of the clips back toward the center of the rail. I find that it stores just fine inside the pannier during the ride. In my opinion, it's sturdy and lightweight, but I'm not an ounce-counter. It isn't designed to be worn comfortably for long hikes, but it's good in the city when it's raining, and you need to run your errands hands-free. I'm near Seattle, so this is happens about 300 days a year. I ride a Trek 7.3 FX for fitness, errands, commuting, and the occasional getaway, so I'm not really touring with it.