A customer from Austin TX USA on 10/9/10
These Ortliebs are well-built, and mount securely and conveniently. I haven't had a chance to test their rainproofing, but have no reason to doubt its effectiveness.
The one criticism that can be made against them is that they're each one big bag (there's a small, flat mesh pocket in each one, but it's located in a way that's not accessible when the whole pannier is fully packed), so you need to figure out how to organize the contents for ready access to what you'll need. No separate pockets must make them cheaper and easier to rainproof, but also less convenient.