I switched over from another Marketplace management system to Solid Commerce and never looked back. Solid Commerce gives you all the tools you need to succeed in selling on different marketplaces Such as Ebay, Amazon and Shopify. They also have a great function to keep track of 3rd party vendors which was perfect for us, and it integrates seamlessly.
The other system was OK, but the price was astronomical. I would highly recommend Solid Commerce to any business large or small looking to get selling online.