The donuts are absolutely fantastic and the best in the South Hills area of Pittsburgh. The cakes are also really good.
I'd recommend against the cupcakes. It seems tough to get a good cupcake. I'm used to dry cupcakes, these were way too moist. In any case, the donuts and cakes are what you should be buying.
If you happen to be here during Lent, buy the Polish donuts. The paczki are my favorite in the Pittsburgh metro area.