This paper investigates the effects of the number of firms and their product-type on broadband Internet quality. We estimate a model that relates the actual speeds delivered, in census block groups to the number of wireline and wireless internet service providers (ISP's), cost and demand conditions, and correction terms for the endogeneity of market structure. Model estimates show four main findings. Wireline speeds are often higher in markets with two or more wireline ISP's than with a single wireline ISP. Excluding the correction terms from the analysis understates this effect. Increases in wireline speeds are larger in the upstream direction, and there is no relationship between wireline speeds and the number of wireless ISP's.