Nah, I was mostly joking. :P It's good enough for the price. All in all good value for the money I say.
However, I see you've already covered 17-125mm already so a 70-300mm APO would give you a better IQ for the bucks ratio in my opinion. The 28-300's design is a little outdated these days, and such a long zoom-range often gives slightly worse optical quality than shorter ones. (such as the 70-300)
If you feel that carrying two lenses is too much of a bother, it's a good choice. Link to test:
http://www.ephotozine.com/article/Sigma-28-300mm-f35-63-DG-Macro
If you like this zoom-range: The Tamron 28-300mm VC is a better, but more expensive alternative.
Last edited by Shashinki; 11-30-2008 at 07:40 PM.