I have shareit in my from the past 2 years. Its the best app to share or transfer file from mobile to pc or vice versa. It comes only for android phone. We can transfer file of any size from pc to mobile or vice versa without using internet. Though there are many apps similar to shareit, such as airdroid, xender etc, all of them use internet to share files. This affects our data usage. Share it shares our files saving our data usage too.
And above all, this app is free in playstore and is also user friendly.
According to me this is the best app for file transfer. Keep updating the app for better use.