Shopify Marketplace Connect

Had a few issues loading onto eBay, but the support via live chat was excellent - 10/10.

One of the down sides with the app is that the slider panel on bulk edit is quite sensitive and not ideal when you use a track pad, as I do.

It also can be quire slow to load.

Howver, it has removed a lot of the faff that you'd normally have to deal with on eBay, so all in all, recommended.