I'm setting up a site in which users will sign up to join a weekly email list - basically a email subscription service in which we send weekly motivation emails for an annual subscription.

I'm using Community Builder with the Constant Contact Integration CB plugin to sign the members up and then populate them to my weekly email list in CC.

However, I need to also use a program to manage my subscribers and process their subscription fee. I'd like to use CBSubs since it is made to integrate so nicely with CB.

So the big question is does your Constant Contact Integration CB plugin still work when CBSubs is installed? They only have an online demo and the component is pretty expensive - so no way I can test myself.

Any advise would be greatly appreciated!

We have not tested this plugin for compatibility with CBSubs. In theory, it should work fine, but has not been tested.
I would also add, that if you find there were issues, we could work with you to resolve.