Understandable, I was actually in the same boat when I first looked into Blesta and saw we had a module. Upon talks with our development I was informed we didn't build it, but was built by the team at Blesta. While the integration works, it wasn't something I was too pleased with as it was way behind our WHMCS module.
Personally, I'd rather see a very unified experience all around for our offered integrations which really pushed me to get ur development team to overhaul the module so it's on par with our WHMCS module. After half a year of mentioning Blesta, our development team picked it up as a project and finished it around two months ago.
The module is refined and up to speed with our WHMCS module (actually has a feature that WHMCS doesn't have at the moment, but I've been trying to get built for about a year now). If you've ever used our WHMCS module (or read the documentation) you'll find that the Blesta version is just as feature-packed with everything needed to properly sell SSL certificates to your clients.
Our development team has also gifted the community with a nice additional benefit of our module, which is the fact that it is all open source. Together with the community, Blesta developers, and our developers, we'll all be able to contribute to the further development of the module.