bunnyfluffer, I have the ARK and the rest of reasons refills except the new acoustic bass one.
now they are doing all 4 in a bundle or a few in a bundle.. when I went to a workshop for it last month, I got offered all 4 for £199, but I owned 3 of them from before and they only would knock off £10 for the bass refill

so I told them to shove it.. as the bundle , worked out FAR cheaper (half price)
The refill is nice, esp the challen and mrs mills pianos, but the rest I don't use so much.
there is some presets with well known piano sounds from known tunes, including lady madonna in the other piano refill they do, so it's good.
the catch with it is that of course you have to be a reason user.
the biggest annoyance though was I had to wait 6 weeks for it after release (thanks to their last uk distributor, not their current one) in reality Abbey Road Studios is all of 10-15 minutes drive
they re did beatle songs a while back with new people like travis etc, BUT using the original mixing desk and techniques , what they did was impressive with it recording wise considering the equipment used.. so as well as the music the engineering side was very interesting also.. and a good insight into what exactly George Martin and co did engineering wise to convey the sound.