Very satisfied buying all sorts of stuff from Amazon. Tools, music, movies, electronics, shop supplies, you name it. A good part of the items come from third parties (Amazon fulfilled the order), and so far I have been quite satisfied. I pay close attention to third party supplier ratings, which helps. In some cases, like when Acme Tool recently became a third party vendor on Amazon, I purchased knowing the reputation of the company in the past since insufficient ratings had accumulated.
I generally don't buy stuff I need yesterday, so I use the standard, usually free shipping options. A recent Bosch order shipped the next day and arrived at the house the following day despite selecting the "free" option. Stuff coming from across the country will of course take longer. It appears Amazon has a distribution center practically in my back yard now.