Has anyone used the app Quickbooks Online by Onesaas?

Looking at Quickbooks Online by Onesaas to utilize through Wix.  Can anyone provide their feedback on this app?  What were its limitations and what capabilities did you like?  Anything I should know about this app that will help me decide if I should use it or not?  Are there any other apps that are better than this one?
Needing an app to link my website sales transactions to Quickbooks Online.