I am also building a connector to QuickBooks to CRM!!

Conductor seems to be good. I am testing it myself. Basic stuff they have covered, I am running into issues getting more complex, real-world setup data out of QuickBooks.

I am not too sure if this is a reliable company to build production systems. I have had a few issues so I sent them a few emails at [email address removed] (couldn't find their support contact phone number anywhere, only found this email) and they have not replied to any of my emails.

So, if anyone know a better alternative, let me know as well.