It just works (what's not so obvious when we talk about Virtuemart extensions). But what's even more important - the support is fast and competent. Not every detail was perfect from the start - but they have really helped me to solve my problems. In my opinion, they deserve 5 stars.
Cmsmart's One page checkout extension for Virtuemart is truly highly preferred, however, when it comes in real, of course, there are problems and we're always ready to support to fix them. It's good to know that you still approved us even when problems arise. Thank you. We will do better to give you more excellent products.