I use it a lot as well BUT watch the pricing. Don't make the assumption that Amazon is cheaper because many times it is not.
Sometimes I can beat the pricing at Carquest or many times at my dealer. Sometimes Amazon is cheaper.
What is does for us is save time, I work in Bangor but after an 11 hour day I could really care less about trying to find something going from store to store. Where we live in a rural area Amazon and Ebay are an irreplaceable source for items that local stores drop from stock, Walmart up here is famous for that stunt....