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.
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One thing to consider is the upgraded speakers retain the Andra I's single binding posts rather than the dual posts that come standard on new Andra II's.
I was unaware of this when I bought a used pair of upgraded Andra II's and was surprised I couldn't bi-wire them as I'd originally planned.
They sound wonderful anyway, so it's no big deal.