Posted: 29.06.2007 at 14.01
I only have a very small amount of experience with them, but I've known a couple people who have invested in them and not found them to be worthwhile. That said, I've heard some favourable reviews as well, though not from any personal contacts. They definitely won't be up to the standard of the Canon-made lenses, but on a budget, they might get the job done for you.
If I recall correctly, you're shooting with a Rebel XTi, right Daniel? If you're thinking about a lens for catwalk/ documentary work, you might want to consider the EF 28-200mm f/3.5-5.6 USM, or the EF 28-135mm f/3.5-5.6 IS USM, which features image stabilization - great option if you're shooting indoors at a longer focal length.