What solution do you use to list product stock to ebay? M2e is causing us issues

I’m contemplating looking at a different solution. We need two way syncing between ebay and our storefront, order information isn’t a requirement, but would be nice. We’re having so many issues with M2e recently including:

• Products getting stuck in an automated queue for hours, stopping us from manually revising
• Multi-variation listings breaking on automatic revises requiring us to fix manually thousands of them every 30 days.
• General syncing perfomance being incredibly slow. Sometimes detecting a price / stock change and taking hours to actually sync the product.
• Random timeout errors coming back daily with automatic synchronisation.

I need to find another solution that is reliable. Whether it is a seperate web platform or something within Magento, I don’t mind. It just needs to work. Unfortunately M2e is not living up to the thousands of ££ we are spending on it.