I purchased the bundle from AD also. Got to play about an hour today.
I am quite pleased with the package and the studio grand - wide ribbon preset sounds very good on my system as is. The jazish preset also has a nice bright edge to it. It would be very easy to tweak/create your own presets from these that would cover most bases.
The upright is quite usable and can be tweaked to fill most background piano parts. The velocity response is very good.
The Mk 1 is the weak link although still quite usable for chord voicings that are not too dense. Spread chords and melody lines sound fine. Would sit well in a mix.
All-in-all I'm happy with the purchase and it was well worth the price for 3 instruments of this quality. Like Bapu said, $28 per instrument is/was a pretty good deal!
Kind regards,
Rick