Big plus on this one! The CMS functionality in WHMCS is way outdated and definitely not worth the mayor cost. The hosting automation on the other hand is perfect en best-in-class. Please consider to mix the best of both worlds with this integration of WP and WHMCS. You'll definitely have the best hosting solution in the world by then.

Current third party integration solutions simply don't work and not worth the try. I think WHMCS should focus on what it's meant for; hosting automation. Leave the other parts to other specialists.