I like the 55-250 f/4-5.6 IS, it is a very capable little lens. My main deal with it is that you can get a 70-200 f/4 which is a LOT better. The 70-200 f/4 is reasonably inexpensive. Assuming it has enough light to work with, the 70-200 f/4 will arguably give the best quality from a zoom lens that you can buy for a Canon EOS camera. If the quality of the image is a concern, it just doesn't really get any better. The 55-250 stops being useful in low light comparable to the 70-200. It isn't that the 55-250 IS is so bad (it's not), it is that the 70-200 is so dang good. Now after about ~150mm, IS really helps if you don't have the light. Of course there is a 70-200 f/4, f/4 IS, f/2.8, and f/2.8 IS (my baby), but the f/4 IS is more expensive than the f/4. The f/4 does have the best image quality of the bunch though. The f/2.8 IS is just more versatile, allowing me to shoot the town block party outdoors @ midnight without flash or a tripod for example. If you turn on an NBA game and look at the photographers on the side line behind each basket, I would bet over half are using Canon 70-200's. I wouldn't be surprised to see an 85 f/1.8 in there either.