This Canon 60mm macro is optically spectacular. It works well and has no downsides, other than being only 60mm and only working on the 1.6x sensor cameras.
If you really want to use this for macro, for only about $80 more the Canon 100mm macro is a much better choice. The 100mm gives you both more working room and a more natural perspective. Unless you're only using this on a copystand, you'll thank me for getting the 100mm macro for macro use.
This 60mm macro is ideal if you plan to use it for general photography and only on the smaller sensor cameras. If you plan to do a lot of macro, the 100mm makes it much more convenient. If you think you may eventually get a 1D or 5D, only the 100mm (and old 50mm macro) work on film and 1.3x and full-frame digital cameras. Read the full review here