Easy, definitly WHMCS, the best one.

I would say MB or WHMCS..!!

Everyone seems to be giving different advice. I've only used ClientExec out of all of those billing software but its been very good - customization could be improved, but I find it reliable and easy-to-configure

i am looking for one of these to work with my vps and configure nicely because i recently tried ihost, and it did not pickup any of my packages and made me very frustated.
so negative for ihost.

WHMCS. Definitely.

They have a lot of payment gateways, integrate with all major control panels easily, and support is excellent and they really listen to Feature Requests being posted in the forums.

I bought their script in March and have not regretted it since.

Clientexc is brilliant no problems with it at all , automates the whole signup and account creation process so you have more time to focus on providing the best possible support and uptime to your customers

I love WHMCS. Easy to use, numerous features, and great support.

ModernBill for functionality
WHMCS for simplicity and functionality
ClienExec for price and simplicity

my vote goes to WHMCS!

WHMCS - Webhost manager complete solution.

I have used modernbill and even tried developing my own but WHMCS by far has been the best in terms of functionality and usability.

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