Weiss 501 upgrade to 4ch

Seeking additional feedback on this upgrade to the Mk2 version. I recently bought the original 501, and it's really good in my system.   

Celtic66- I think you offered good details of your positive impressions you heard in the Mk2 upgrade, enough to encourage me to strongly consider the upgrade.

dhali777- Could you post your impressions for us? 

Has anyone else performed the upgrade or compared the original 501 to the updated 501 Mk2?  I find very few postings on the internet about actual listening comparisons, which seems strange.  Thanks for sharing any experiences.

I am also considering this upgrade and would appreciate any other observations people may have.

@rtilden if you add the @ in front of the username and choose it from the pop-down list then they will be alerted, if they have notifications turned on. 

@dhali777 ^ 

Thanks, @mclinnguy.  I did figure out that little trick while trying to converse on another site/chat.  You guys must (rightly) think I have been living in a cave for being unaware of that function- Haha.  

@wsrrsw was probably the most recent to have this done. Hmm, hmm?