I'm a student on a bit of a tight budget and have the opportunity to by the above mentioned lens for under £200 to go along with a new 350D. I'm after a telephoto lens and since this is from Canon's L range and in my budget it sounds like a good buy. The only thing that is slightly putting me off is the fact that it's discontinued and quite an old model ('87), and as such has a 'push' mechanism to adjust focal length (no problem with this, others seem to dislike it but my dad has one with the same mechanism and this doesn't bother me) and is apparently rather loud. Being loud vs. today's models is to be expected I suppose, but has anyone got this lens, just how noisy is it and is it still worth getting (for this price or otherwise)? Thanks a lot.