Zuiko 18mm-180mm ????

I am thinking of buying this lens for my E-500. I want to stop changing lens so much. For conveniance and to reduce the possibility of dust. Has anyone used this lens? Any Advise or problems?

http://www.adorama.com/IOM18180.html

Although I have heard good things about the lens you listed above the complaints I have heard about it are form teh aperture range.

For half the price you can get the sigma 55 - 200 from B&H cameras and get a half (I think its a half stop.. my math sucks) stop better at max zoom. (Zuiko lens 180 - F.6.3 - Sigma lens 200 - F5.6) and it is retailing for $149 (link: http://www.bhphotovideo.com/bnh/cont...goryNavigation )

Thanks, I saw thw Sigma's but worried about the quality, Are they good lenes?
Greg

If you look at my gallery anything in the past month has been taken with the Sigma 50 - 500 and the quality is excellent once you figure out the lenses best exposure settings. It took me abou t3 weeks to figure out my lens but it has replaced the first kit zoom lens completely form my camera bag now.