I did a long review of this upgrade on Audiogon last year. It should answer most of your questions. The upgrade is the best dollar for dollar expenditure you could possibly make to your system.
Eggleston Andra to Andra II Upgrade?
Anybody have any experience with the older version Andra as well as the newer Andra II. Eggleston has an upgrade program and I was wondering if the difference was worth the effort...not to mention the expense. I've had my Andras for a few years now and have been quite satisfied...but you know the deal. You always want it to be more betterer...even when it's pretty damn good already.