A very simple to use extension, with one of the cleanest checkout process on the market. +
The best support ever, this guys even chat with you inside the admin of the extension with this cool "intercom" tool.
New version and upgrades all the time, one on one support... just great...
I got the invoice tool, works like a charm. Then I needed customizations and this were done, at the right price, fast, and just as I needed.
This is a really valuable tool and help me create a custom CRM for my client, in just a couple days.