The Vapen is a really interesting bat.
Despite its profile, you can virtually hit it anywhere and the ball flies - it has great ping. Edge, lower, middle, upper (obviously not too high on the splice) it doesn't matter.
Unlike the GM and Kooka where you can tell exactly where the ball has hit, there is very little feedback with the Vapen, it is really hard to describe. The RNS is similar.
It is a great bat if you need to score quickly as it feels like a ball masher in the hand.
Unfortunately you do need some discipline so you don't try and bash every ball, hit a rash shot and get out.
The bowlers in the team hate it at net practice