Got this one for my Canon 350D and it followed me to the 30D and on to the 1D Mk III.
Its fast, cheap and light and a great tool when first trying out DOF and DSLRs. Durability is an issue though - after one year some plastic came loose on the inside, but it doesn't show up on the pictures (probably because of the 1,3x crop factor).
AF is a bit slow but I still use 50 mm from time to time - especially for product shots. But will not replace it when it finally breaks - instead I will look for a 50 mm 1.4 or a 24 mm 1.4L (nice but expensive)