Shareit is quite famous platform for sharing any kind of documents and files between android phones. I too have been using this but not very much some of the reasons are
It is unable to find the receiver if you are on android 6.0
It doesn’t send files smoothly on android 6.0
File transfer is aborted in the middle of transfer process.
It is not able to stay online in android 6.0 and other users are unable to find your device.
It gives too much irritating ads or pop ups about other features.
Transfer speed is no good than Bluetooth transfer on android 6.0
Concept: it is good but when it fails to do basic things it becomes irritating for you. And for hours together its unable to trace receiver.
Layout and Design : is okay but its not best.
Features and Functions : only function it has to do is file transfer, which it’s unable to do on android 6.0. Other Features like cache cleaner, residual Apk reminder etc are ok but not as good as Clean master. It sometimes deletes useful data too.
Usefulness : it used to be useful but since I changedmy phone to android 6.0 it became useless for me. As I hv not been able to transfer data via this app smoothly as it used to be on android 5.1
RECOMMENDATIONS : I dont feel it’s worth Recommendation if you are using android 6.0 marshmallow. On lower versions it may be working ok.