I thinking about getting the 532 folding rear basket, possibly a pair.

I've got a backpack for my school books. Was looking at panniers (either a single or double-sided) to put clothes/wet/cold weather gear in. I also have an old pair of Nashbar Townies that I don't trust my backpacks weight in. So, I'm now considering going with baskets. (I've also got a milk crate, but it won't carry enough.)

I know that they are on the heavy side, and that people consider them noisy. I'm not overly worried about the weight, and I think that I could live with any potential annoyance from the rattling. But they look like the solution to my problem. I've got a bunch of backpacks/duffels already...

Any glaring cons that I should be aware of? Besides the weight, noise, the need to 'modify' the mounting...