I even used this application for quite some time. Here is my review below :

Pros :
* Free and open source application where you can use them for free
* No need of internet connection where it can run offline and can be connected to your local area network
* A good and fast messenger for your LAN where you can easily send and received messages without delay
* It does have a built-in file transfer functions where you can easily transfer files at ease
* You don't need to setup anymore since it will likely to run using it's executable file
* Fully supported on Windows, Linux and Mac

COns :
* It is a great application software which i don't see any negative feedback on this