I have taken out a trial of WHMCS and so far it looks ok.
The main reason I want to use this is because of the integration of being able to sell domains, web hosting packages and sending out invoices to customers. It's basically a complete customer management system.
However, my only issue is that I can't find how you'd integrate it into my Joomla website, and this is making me think I'd be better off going with another solution.
Has anyone had any experience with integrating WHMCS into Joomla? In particular, looking at the logging in (i.e. having a single login for both Joomla and WHMCS)?