eCommerce and Atahualpa

There seems to be a growing interest in integrating an eCommerce function in Atahualpa based sites...

At the risk of opening up this forum to discussion of non-Atahualpa related issues, I'd like to see some feedback on:

1. What, if any, eCommerce plugins have been found to work in Atahualpa and...
2. Any Atahualpha specific workarounds that might have been found useful.

In my own experience, I've implemented a Zen Cart site before, but besides being a very complex package, any 'integration' or even association with the main Atahualpha site is a thankless task. This seems to be the case for every external eCommerce package I've looked at. Prestashop looks like it might be easier to re-skin to look like the main site, but I'd really prefer a fully integrated solution.

As already mentioned here - the less said about the wp-commerce plugin the better -- a monumental waste of time and effort.

I've purchased a copy of Shopp, and it looks like it might provide the best option - a reasonable feature set for any small to medium online operations, and so far no apparent conflicts with Atahualpa or any of the other plugins I rely on.

Anyone else with opinions and/or experience to share? -- for the sake of Flynn and others here, directly related to Atahualpa please...

Jack