I like to spread out my stores amongst multiple hosted cart solutions. This prevents me from keeping all my eggs in one basket should things head south with the solution (*cough like MonsterCommerce *cough). 3DCart has been one of my solutions since 2007. When I started, they were a young innovative company that was a little rough around the edges. For instance, the support department was small but still highly responsive. Slowly but surely 3DCart developed into a more and more sophisticated operation.