I know I could ask in the Touring or Communting forums, and perhaps will. But I wanted to post here first. I'm considering getting a set of these to use in the rear. Standard size panniers are a bit larger than I need for daily commuting and I find that I fill them up with stuff I don't really need. (I'm a believer in the adage that if you have space you'll find a way to fill it up.) I'm interested in: 1. ease of mounting, 2. ease of use, 3. actual ability to keep things dry, and 4. longevity. These seem to be a bit pricey, so I don't want to make the investment to only regret it later. So, any of you using them?