Xero and Quiickfile Integration via Zapier

Hi there.Does anyone have experience of the Xero-Quickfile integration, which appears to be two way? Does it do what it appears to say on the tin; i.e… if client uses Xero, can I complete VAT using quickfile and it can reflect back to Xero? It seems too good to be true!
I have potential business for accounts using Xero; I have Xero training but would rather use quickfile, but the client, a large practice with many clients, would not move away from Xero for its clients…
TIA