While WHMCS offers some semblance of integration into your website by creating a template similar to your site, this plugin really kind of takes things a step further and protects you from that day when you want to freshen the look of your wordpress website. Seamless integration and the ability to calmly walk away from all the billing hassles and ensure your company looks as professional as possible as a hosting provider.
I had only one small issue with the plugin which was likely due to a conflict and Erik, using a screen sharing program and skype phone call had it fixed in under 5 minutes at no charge. Excellent product and over the the top support.
THANK YOU ERIK