I haven't used Hope Billing yet. Does anyone know if it is good or not? I have changed many aspects of my web hosting service and am working on using different billing software than I have in the past.
I've never heard of it, I've had a quick look at there demo version and its very basic. I wouldn't recommend using something that isn't heavily supported.
In the case of Hope Billing, I completely agree, but when it comes to open source software in general then I disagree. Well maintained open source projects are as stable and secure as commercial alternatives, and very often get updates and security patches out faster.
Remember that commercial software may also not always be up to date or secure.