G'day, cosmeticsos, and welcome to
Kunena.
I wonder if you could put yourself in our shoes for a moment and look at what you wrote as your subject ("HELP" in large capital letters) and, in a community-driven forum that is setup to help its members, how we might respond to another question that asks for help? :dry:
We get a few topics like these, from time to time, where people ask our opinion what we know about Brand X product or whether Kunena is a suitable choice for what they want to do with their webcraft. Topics, like these, for example:
I honestly have no idea how to advise people if
Kunena is the right forum choice for their requirements, without knowing what their requirements actually are. I don't know what
jReviews does, for example, or what's wrong with using the standard Joomla login module or registration process unless people tell me.
Kunena is free: free to obtain, use, modify or do whatever you want to do with it. If you like it, then use it. If
Kunena doesn't suit your purposes then you can change it (or pay someone else to change it for you if you lack the necessary skill) or use something else instead.
In answer to the questions you asked, I don't know the answers but, in all probability,
Kunena is probably the solution you're looking for. At the very least, the only real cost at this stage is your time to download it, experiment with its features, and decide for yourself whether it meets your needs.