WP.osC or other eCommerce solutions

Has anyone investigated WP.osC? (http://www.wposc.com). It is a modified version of osCommerce that can be integrated with Wordpress and "use" the same template as the Wordpress site (sort of...). There is a modified version of Atahualpa available for WP.osC, but WP 2.7.1 seems to break it.

The concept is great (though osCommerce is not my favorite eCommerce solution), but getting it going and maintained through various upgrades is worrisome. I love what I can do with Atahualpa, but I really need an eCommerce solution to go with it. (no... WP-eCommerce, the plugin from New Zealand) is not the same thing and not a viable solution for many reasons.

Any experiences or advice to relate here?

Thanks,
Jack