I've deployed this plugin on multiple sites for my clients and it's been nothing but an absolute piece of garbage. Not only did they're latest major update completely screw up all our existing work but their uninstallation script doesn't even remove the database tables as is required by WordPress protocol.
These developers used to claim "We've been told we make the best shopping cart ever..." Incredibly arrogant and thoroughly inaccurate. Probably the most ROBUST cart, or feature rich, but definitely broken. Cost me time, money and frustrated clients.
For your own sanity don't use this plugin.