Cons: Frontend is impossible to post an article to. Backend is impossible to understand, find what you're looking for, and basically do what you want to do. There are no clear explanations in the admin, or in the documentation. There's really no easy way to get started, there's a very time consuming learning curve involved. After a year, I'm still not sure what I'm doing!
Level of Support Received: 0
Why? Because you cannot Register on the K2 forums, their system is broken (email confirmation does not work) and you cannot get Help unless you have a Ning site, I guess, because I was unable to use their support form... No way to reach the developer.
Ease of usage and deployment: Extremely Hard. You need to be a programmer, and a Joomla expert. This does not work for new Joomla users, it's not recommended for designers who do not use Joomla constantly. This is way harder than WordPress for instance (my recommendation).
Purpose of using the extension: To allow Admins and Registered Users to Blog. So far, I've only been able to get the Admin going. Frontend users are not able to save entries, the internal link within the Blog Article form is broken, so the system is not fully functional.
Level of Difficulty: Pretty High...
My Experience Level with Joomla and Web Technologies: I have only built 2 Joomla sites in the past because it's too hard for my clients to learn, but I have 13 years of website design experience and a Bachelor's Degree in Website Design and Development.
we are open to accept recommendations to make it better, regarding the buttons of Apply/Save you mean all of them? Just create a ticket or drop us a mail and we'll gladly help you to set it up :)