Your favorite/Dreadful E-Commerce service?

What is E-Commerce? It's the buying and selling of products or services over electronic systems.

Electronic commerce draws on such technologies as electronic funds transfer, supply chain management, Internet marketing, online transaction processing, electronic data interchange (EDI), inventory management systems, and automated data collection systems.

Examples of this, is pretty much middle man services such as paypal, western union, money gram and more.

So post your favorite and most hated of any e-commerce businesses online that supports electronic marketing, and your reasons for it.

I'll begin:

My favorite is money gram because of it's simplicity and safe trading so far I've been using it for a year and encountered no problems with it and so many sites support it, which is great.

My most hated is paypal. It's a horrible business, the representatives are slaves. They will completely nail you just for the money and you will be held accountable for any purchases you've received instead of the opposite, which is such a load of bull. I guess it's good for only e-bay related purchases, but it's still pretty bad when trying to protect you.