Buying large audio equipment

Hey Guys,

After purchasing some sweet Polk audio tweeters from Amazon, I'm now one step away from completing our "home theatre" system. Only thing left is a nice woofer but as I was about to get it from Amazon, I literally removed it from the cart. The only thing that's holding me back is the size.

I don't purchase large electronics online. Just because of safety reasons and the annoyance that may come with returning or exchange the product etc.  I trust Amazon and love how they release an invoice right away but still . . .

Have you guys ever bought any large audio equipment online. Is it a safe bet? Or am I better off just walking into a BestBuy, etc.