The new Turbo is very nice (rode it in El Medano where the boards are designed and tested) - AFAIK all the details are due very soon?
It is very similar to the Dundee in that it is the most composed and not as hooligan-like as the Monk - it was the easiest to ride when overpowered on a 5m!!! However, people are either Monk or Dundee fans - you either like to go ballistic whooping all the way on the Monk cutting through chop with impunity, or you like the more tactile feel and control of something like the Dundee/Turbo.
That said many Monk fans might appreciate the new Speedball ? a strange mix of both without being either and defies being pigeonholed. Works great on a wave and feels tiny underfoot and(in a good way) when in the air so you can bust out tweaks and grabs?
Me I prefer the Ultrasonic as a board that when you push it pushes back and just grips harder and harder until you release it - if you can then try a few of them back to back as they share similar traits, but Mark has designed each with a type of riding in mind and you don't know necessarily get what yours is until you try it?
Speedball testing