The idea with this store is that assets built for many different game engines can all be brought together in one central store that all game developers (especially indies) can draw from. After scouting around their site and posting in their forums, I've found that while their user base and publisher/creator group is growing, it is not quite near the size Unity asset store. Regardless, they seem to have a relatively high standard of quality, so I think it would be fair to say that anything you purchase there will have some value to it. Because they accept .unitypackage files, many publishers can quite easily clone some of their Unity asset store products to GameDev Market. Obviously, the more file types, the more users will want your product, but there's no rush to amass a larger group of file types. If you do work with Unreal as well, those assets can go right to GameDev Market, and they don't have an exclusivity policy (that is, you can still legally sell the same products in other stores). Another huge bonus that Unity asset store devs will appreciate is that GameDev Market aims to review any submitted assets within 48 hours! That's fast considering the asset store normally takes 1-2 weeks. It isn't difficult to get started as a customer or a creator. Just do the usual email address with validation, and put in your info if you want. Click here to go to the GameDev Market At this point, the biggest need of GDM is users and developers. Hopefully you will consider being one of many who are actively supporting this new market.