I used their Dreamweaver and Contribute3 plug-ins for eBay, not their own freestanding platform.
They were superb. The only problem is, they didn't work as advertised for many months, and international customers got continual errors. We all banded together to lay the smackdown on their forums....and won. They were great, arranged free video conference calls to examine every error that non-US customers were getting, and eventually released a new build.
So, at least you know you'll be supported.