The Ice Sport band I just purchased from Strapped & Co is nearly identical to the Apple version but at a much more reasonable cost.
The look and feel of the band is surprisingly good, and the fit is almost exactly like Apple's. The only difference that I have found so far is that it is slightly thinner and lighter than the OEM band (as others have said), but I think that is a good thing rather than causing it to suffer a hit to it's quality of look or feel. The band fits into the ports perfectly, has no overhang, and seems to be attached strongly just as you would expect from the first party band.
I am hoping to continue to expand my band collection with more third party bands, and as far as the sport ones go, you can't find much better than these from Strapped & Co.
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