Hello Martijn,
Just saw you are a neighbour of mine(countrywise: i am from Anwerp/Belgium)
I am finalizing our newest website/é-shop and came across this feature.
A download was made into a testenvironment and it really looks great, however :
1) can this extension be used into a multilingual site (french/dutch/german)
2) is it possible to adapted the automatic émail-message in a more personalized form and look.
3) read you are talking about a pro version, when would this be available and which features will it have.
4) what about silent registration(virtuemart): i saw while testing that a customer needs to log in. In the case of silent registration there is no real emphasize on login to keep the "drempel"

as low as possible
looking forward to receive your comments and info
Luc