This lens was given to me as a Christmas gift in 2005. I've been pleased with it for portraits and product-like photography. I would prefer something a tad longer, and am going to replace it with the Canon 100mm f2.8 very soon.
I have never gotten over how sharp this lens is. It does a great job wide open. It doesn't take up too much room in the bag or pocket. I've run around state parks shooting birds, but always brought this lens with me in my pocket just in case something small catches my eye. Moving to the 1D series, I won't be able to do that anymore with this EF-S lens.....another reason for getting rid of it.
I would recommend this lens to anyone who wants to get started in Macro - it is an excellent lens for macro beginners (like me) because of its sharpness - call it somewhat forgiving of your beginners skills.
I had to work on my manual focus skills using this lens because the AF hunts quite a bit. Aside from the AF and focal length, this is an excellent lens for the money.