http://www.mediamonkey.com/information/gold/

Duplicate finding is in the standard version.

Don't understand what you mean by "new improvements without using mm player"

No in regards to streaming over Google.

Alright I'm trying to see the difference between free and gold..
My library is a mess
Would the free version erased duplicates
Would I be able to use all the new improvements without using mm player
Would all my music be able to stream on Google cloud with the new improvements.