Another WHMCS users here, we previously ran MB4 and then MB5 but it was just going downwards, now we're very happy with WHMCS.
When I first entered the industry (around a year ago), I tried ModernBill 4. I really didn't like how it looked, so I had a friend upgrade me to ModernBill 5, which I thought looked absolutely hideous. I love WHMCS.
We bought the software right out, and it's really great. It integrates really well with Cpanel. The only thing is their latest release does have a few major bugs in it. We have been in direct contact with the developers, however, to quickly resolve the issue.
we are using it for good while now. Works pretty well.
Only issue we could find out is when you try upgrade versions. Causing many conflicts and complications. But within matt's help and some headache you get it over
Anyways, After testing both WHMCs and MB. I would go with WHMCs
I must admit we have been very happy with WHMCS but as with all billing systems, make sure you put the security in place to help frustrate the hackers...
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