ANSWER:

Opensource doesn’t mean free, although ISP config is free to use, you WILL need to buy the manual (because boy will you need it!).

There is no difference of better/worse between open⁻source/closed source programs. So this is also true for control panels.

The thing you should be looking at are the differences in features.

by Lucas Kauffman from http://serverfault.com/questions/383920