
Two things. The price and the user experience. The free version offers ample options and functionality for small businesses. The paid version is reasonable and offers even more options for larger businesses.
I will also add that both web access and client app is available which is very convenient. Review collected by and hosted on G2.com.
One feature I would like to see is an exposed API for customers to interface with the software so that more processes can be automated. Such as adding products, updating pricing, generating an invoice. These items could be automated and triggered by other platforms in the organization. Review collected by and hosted on G2.com.