Mastersound Compact 845 preamp upgrade

Hello to all Mastersound Compact 845 owners. 

I'm thinking 'bout upgrading my Compact 845 with Mastersound Ph L5 v2 preamp. 

What are your experiences with this upgrade, what will I get (or loose) with this preamp? 

Thnx for readin'! 

Best regards, 
Jurica