I have the Trek interchange oanniers. I've used them for almost 3 years (includes winter) and about 11,000 miles.
I actually don't have a lot of negatives. They snap on and off quickly and securely. They are waterproof in terrible downpours if you deploy the yellow rain covers. They have held up for me so far, no zipper issues or whatnot.
What can I say? Roughly 1200 one way trips. No drama. Lunch and tools on one side, clothes on the other and I'm off and riding.
Here they are on the summer ride: