Plugin good at first glance.
The main problem I have is that it isn't perfect for membership site, hopefully they can fix this.
If a WP user creates a support ticket, but enters a different email address than the one on their account, KB-Support doesn't link this "KB-Support customer" to WP user, instead creates a new "customer" in KB Support.
This makes for a lot of extra work trying to find the actual WP user (when trying to change their details, or fix account problems, etc), especially a problem for me running a membership website.
I have tried deleting the duplicate KB-Support customer, changing the email address of the other KB-Support customer to the new one (matching the WP user email address), and it still doesn't link to the WP user.