I've used the planet bike fenders in the past. I don't like the extra weight or how cumbersome they can feel. However they did a great job of keeping the salt and stuff off of me and the bike during the chicago winters. Also I liked how easily I could put them on/take them off.
Now that I'm in seattle, I plan to upgrade to crud roadracers. I'm sure I'll sacrifice some coverage for better fit, less toe overlap, etc.