Cons: The membership area functionality isn't as great as other solutions, but I understand they are focused on being the best funnel software, not the best membership site software. If they upgrade their membership area and email / list marketing features, I would move everything onto clickfunnels. That would be dream, rather than integrating clickfunnels with an email tool and membership tool. I know they're working on improving these solutions and I'm looking forward to this software becoming that much more amazing.
Prospecting and marketing are all the things you do to get people into the first of your sales funnel stages. Note that stages are broken into two or more steps wherever possible. A demo could be called a single stage, but in real life it involves a lot of things: contacting the customer, sending reminders, doing the demo, and then following up. Whatever your own sales stages look like, the support you need in managing them will be the same.