I've a 6.3 and 5.5, and also a yet-to-be-used 4.7 Maui edition.
Rigging & TuningI use a Pryde 430 Carbon RDM for the 5.5. and 6.3, which is a bit softer at the top than the recommended Hot Sails Maui HotRod masts. I found rigging them just right to be an experimental process at first. I had a 5.8 on loan for a few days and on the Pryde mast the leach just couldn't be set right - far too loose. Tragic even. However I've found my 6.3 and 5.5 to be just fine on the same mast. Go figure.
They take a lot of outhaul, requires a foot on the boom. Perhaps +6cm from neutral position after downhauling. I rig them so the sail almost touches the boom when powered up for a medium setting.
I think after using them perhaps a dozen times each I've got the rigging and tuning down pat. I've tightened the battens a couple of times and the sails now seem "broken in".
I've only rigged my 4.7 in the garage so I can't speak for it. (I missed yesterday's session

). It rigged perfectly however, as per specs; looked good. That's on a hot rod mast btw.
4.7 Maui Edition (It's fluro!!!)
On the WaterThe experience so far with the Super Freaks has been exactly as the brochure advertised. They're so piss easy to sail, which as rande said, allows the sailor to concentrate on other things, or just relax and have a good time. Gusts are absorbed by the sail keeping it all super stable.
Wind range, especially at the top end is huge. Gybing is effortless as the battens are nowhere near the mast anyway. The sail itself is eerily silent - there's no monofiilm to bang around at all. As an added bonus you can actually see through these sails. Visibility is second to none. Build quality is luxurious.
Power is good, the delivery very smooth. Top end speed is lacking. Can't have it all.
They're good sails for freeriding, they'd be ok for freestyle, nice for bump & jump and excellent when things get a bit scary.
ComparisonI previously had a pair of Neil Pryde Alphas; a 5.4 and 6.2 (2011? The last of the shiny ones). The Alphas would go pear shaped when overpowered - very back handed. I'm not sure about the Alphas having more power, maybe slightly. This surprised me the most although the SFs are ever so slightly larger. The Alphas were faster (they ain't a slow at all actually). Actually if there's one complaint I have about the Super Freaks it is their top end, it's a little lacking but I guess you can't have everything. The Alphas were certainly noisier. In fact so much so they drove me a little insane. They were like cans being crushed overhead. The Alphas were all about direct power for south east Qld. light winds and they were excellent for that. The SFs are almost the other end of the scale; indirect smooth power.
All-in-all I prefer the SuperFreaks. They are so damn stable. If I was thrown out into a storm at sea and asked to pick a sail it would be these, or perhaps something from Ezzy. You can put your weight in the harness and almost let go the entire session and flipping the rig is a pleasure too. Except for top-end speed I prefer the Super Freaks over the Alphas.
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I've no idea about your 4.7 jn1. Twitchy to the point of being back-winded?! That's really bizarre, especially since your 4.0 is so good. I'd ask Mr. Hot Sails Maui/Jeffrey Henderson himself, apparently he's always available on his site's forums.
www.hotsailsmaui.com/forum/viewforum.php?id=1