A bit late with this reply, but here's my feedback on de_cliffs. I really enjoyed the layout, first of all, it was a lot of fun.
Here are some suggestions (mostly from T's POV). Bombsite A seems really good so far. As suggested before, mid could benefit from some improvements regarding the cars. It'd be easier if there was a ramp or some stairs to get up to the CT level. I wasn't inclinded to take the route to bombspot B a lot, since it was usually pretty difficult. It might be because of the T-junction (CT's guarding the spot from both sides of the junction, making it pretty hard to push on through that spot). It might make things more fair if you adjusted that junction a little bit (see picture below). It's just a general idea off course, making it harder for CT's to guard the path from 2 sides.
[Blocked Image: http://users.telenet.be/gus/de_cliffs_a9_01.jpg]