Will you please give me some skype reviews?

Hi everyone. I have heard about the Skype and I have decided to install that on my phone. But before that I do this I need to take some advices and reviews from the actual or the present users of the Skype userbase. I know that many of you might be actually using that on your phone. So what is it like when it comes to have a good communication? Is it free? Will you please give me some skype reviews? I will be looking up for an answer from your side. Thanks and have a great time!