As I have DT stores nearby, I've never purchased from DTD. As noted, I'd think as long as your money is green or your CC good, they will do the installation services. That said, I'm sure b&m DT would 'prefer' to have the tire purchase with the store, and get credit for the sale too. As they are going to be the ones to service the tires and warranty after the sale, that's my preference too. So when the DTD price has been lower, I've had my local store match the DTD price even with no tax. YMMV on that. But even if not exactly matched, for the reasons noted I'd be willing to pay a tad more for the relationship with the local store. Just me.