Hey John W,
I sailed a 4.3 this weekend in a blow and it was a hoot. I'm curious what your perspective is on some of the issues I mention in this review...

I sailed a Mystere 4.3 for the first time this weekend. It was a decent blow of probably 15 steady with some gusts over 20. Waves were not that big. 2 to 3 feet or so but pretty short. Might have been a bit more. I watched Mike flip his A cat 4 times and the I17 sailors were sailing 2 up to keep the boats down.

This boat is set up pretty nice. We sailed it double handed with all 3 sails.
Setting the boat up Alex showed me a problem with the jib. When sheeted tight the tack of the sail gets wrinkled. 2 things that contribute to this are a halyard with stretch in it and the sheeting angle. I moved the attachment to the bottom hole of the clew plate and that helped some but still when sheeted tight about the bottom foot and a half get wrinkled. There is nice shape when it is eased though. Out on the water, it wasn't a major problem as it needs to be let out a bit, but there were times when the jib was misshapen while sailing.
Another design problem is the rudder system is very finicky to get the tension right in order to kick up. Seemed like only about half a turn on the spring screw would go from kicking up to locked hard. I have heard of Mystere rudder problems in the past so maybe this is that problem.
The platform is very solid with little flex in the hulls.
One thing I noticed immediately is that it will turn 3 foot waves into one wild ride. It felt like open ocean sailing on a bigger boat.
It was a fun boat to sail but I constantly felt a bit on edge like it could pitch pole at any given moment. There were several near misses including a couple times the entire boat drove under water and came back out. It was a hard boat to trapeze off of due to the size. I wanted to get further back but ended up with one foot on the shroud and one at the rear cross bar to keep footing. This seemed to work best but still put the weight a bit far forward. Another issue of the size of the boat was limited freeboard. 2 up with around 370-380 waves would slap the rear beam hard. There seemed to be a fine line between keeping the rear from slapping waves and the front out of the water.

If you get a chance to sail one of these go for it, they are exciting. It will make your 18 or 20 footer feel like a Cadillac.

Also posted on my website. www.hobiesailor.com