I have just heard back from kosmos: it appear that the following 2 are the same product:
http://www.kosmoscentral.com/ecommerce/mods/x-cart-ebay-orders-integration.php @ $175
http://www.kosmoscentral.com/cart/eBay-Orders-Download-Integration.html @ $375
The $175 price tag is no longer valid and they have had to sell the product at $375 as it requires lots of support in order to setup correctly.
I really like the idea of being able to integrate my eBay orders in the same place as my x-cart orders but I'm not sure that I need it enough to justify $375.
I already use eBay Auction Manager by Safetynetweb
https://www.safetynetweb.com/Auction-Manager-for-XCART-pr-5.html currently @ $79 which is great for sending data to eBay but not great for getting data from eBay (limited to stats and product qty).
If I decide to pay the $375 - I'll post a review here.