For the 2 years our hosting has been in biz, we have used WHMCS all the way... it has really grown in all areas

I just started evaluating WHMCS myself for a client and I am absolutely impressed with this pacakge! It's very clean looking, the install was a breeze and so far all the functions just seem to work.

I couldn't even get modernbill installed let alone trying to get it to work!

I use it and I'm real happy with it. Nice clean interface, easy to use and install. Good support and updates, has everything I need.

I love using whmcs because of it's ease of use. I also like that it tells you the codes to use to offer domain lookup and registration on the main website. And the support system is a plus!

We used to use WHMCS, I loved it, but I built a custom php solution which is less complicated, does exactly what we want and is a whole lot faster. Having said that, I still work with WHMCS (integrations for people).

WHMCS is very user friendly and simple. 10/10 votes for them.