We have a Mark 1 which we bought and installed in 2004, we originally bought it for the water
mode to use on an Atlantic crossing
because we had found that wind
generators perform poorly down wind but have found both modes are good.
It does what is it says on the tin in both modes and it does not have to be mounted in the middle of the stern, so you can have a wind vane
and a Duogen fitted.
Recovering the pole in water mode when you are going fast can be quite challenging as the “dive” plane really works in holding the propeller
in the water.
We deal with the UK manufacturers direct as this is who we bought the unit from and we have found the owners, Pete and his sister Alison to be excellent, they reply to every email
with good, solid technical feedback and have shipped me bits from the UK to all over the Caribbean
. (There are a lot of US companies who could learn a lot from this approach to after market sales support)
I believe that the current
models are up to Mark 111 from what I saw at Southampton boat show
last year so the design is still evolving. They have incorporated their customer feedback over the year on how the device works and have used this feedback to carry on upgrading the device and I have also noticed they now do a water only version.
I have no connection with the company other than being a happy customer