Welcome aboard Amelia
There seems to be a greater variance in build quality with Sigma lens. When I was looking for a 10-20 wide angle I could not make my mind up whether to go for the canon or the cheaper sigma. As a consequence I visited many different camera shops to compare the lens. I noticed a marked difference in the focus ring stiffness with the same model of sigma in the different shops. In the end I found a Sigma with a smooth focus action.
I would be inclined to follow Mikes advice and see if you can get a better one.
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