There seems to be a general attitude out there that the 18-135mm lens is a poor performer simply because it's a kit lens. Folks, the 24-105mm is a kit lens. If you depend on hard scientific analysis, look at the SLR Gear lens review of the 18-135mm. It has very strong image quality. If you depend on subjective opinion, I slapped one on an APS-C body recently for a compact set-up on a vacation and was extremely happy with the results. The lens is sharp and the colors are great. Oh, no, it doesn't have USM. Meh, cry about it. If you're livelihood isn't dependent on your images and you don't need weather sealing or f/2.8, stick with the 18-135mm. It's a great lens. ZachyP, somewhere down the road I'd be looking to get a couple fast primes or the 10-22mm to complement what you have. The 10-22mm has equally exceptional image quality (considered a "pro" lens by Canon CPS), and many non-L primes offer equal or superior image quality to L zooms, while achieving wider apertures.