I was as very pleasantly surprised by the performance of the 18-55 IS as I was disgusted by that of the 18-55.
The 55-250 IS, which I've only fairly recently acquired, is very serviceable indeed, but doesn't quite match the 18-55 IS in performance in my view, being weaker at low-light focus and suffering more CA/PF, often to the extent that I can't eliminate it with DPP.
That is not to say that I'm not satisfied with the 55-250 IS, which I am, but rather that the 18-55 IS is just that much more fantastic for its modest price.
My expierience is just the opposite between those two lenses. Most of the time I hate the 18-55 IS. Perhaps I have a bad copy and will probably send it back for a lookover.


