I usually cannot be bothered to write a review unless the application truly deserves one.
Let's just say I have paid for a tried all the available one page checkouts for Virtuemart and none comes close to this one for aesthetics, ease of use and most importantly, working 100% 'out of the box'.
All the others involved hacking code, bug fixing, css styling and other irritations.
This one installed and worked 100% as intended straight away.
Forget the rest this one is truly the best.