I have bought from them a few times over the years -- they are probably one of the safest, most reliable companies you can deal with on a long-distance basis. And their website has tons of research info. There are other reputable tire dealers out there, too, and sometimes you can catch deals that are too good to miss.
I like to shop local when I can, though. Some local stores will price match, so if you take them your best deal (including shipping etc so you compare total out-the-door costs), you just might get the same price locally and help keep your neighbors employed.
