This a android world. every persons are using that operating system and everyday more and more persons are going to use that operating system. and sharing is a essential function for any of operating system. initially people were using infrared and Bluetooth for sharing. that two sharing features were very slow and taking very much time to share even small files.
But with the app like xender now file sharing has become very easier and lightening fast. with that app you can connect to your multiple friend at single time. and can also share your bigger files very fast. in older days sharing even a music files were taking very much time but now you can transfer even movies with great speed using that app. so I think this is an innovation and made sharing experience very exciting. it uses your handset wifi function to share files. and sharing over wifi if always very fast.
so it is a must have app in an android mobile.
BUGS: sometimes it takes too much time to connect with your friend and become headache sometimes during connecting and it provides only phone storage option in some handsets. and while using that app you will loss your broadband and internet connectivity is well. they should fix that bugs with more exciting version of app.