Just an update on this as I installed the update on Tuesday.
The Stem Splitter feature is excellent. I loaded in an old mp3 of a mix we did back in the 90's (the masters are long since lost) and ran it through the Stem splitter.
I ended up with 4 stereo stems:
Drums
Bass
Vocals
Everything else
The separation is pretty mind blowing and it allowed me to add EQ and compression to each. I've now managed to remix the songs to a much higher standard than before!!
The Virtual bass and keyboard players are pretty good too. You can get a decent part out of them and then convert to MIDI for fine tuning.