The MA's are the perfect mid-road between the Std JET and the JET HA's.
As you would expect with a lower aspect foil, the glide is not quite on par with the like HA, but where they excel is in their control and ability to keep working even with 1/2 breeched. You can turn these babies harder than anything I have seen, the are super punchy and ready to pop up at a moments notice.
A controlled top end speed allows you to ride closer to the wave/energy source, and engage more with actual swell and wave for real wave riding not mild "S" turns out on the flat.
Pump is better than you'd think for a MA, but of coarse not on par with the HA's. This said at my 90+kg I can double and triple dip the 1200MA, and more with the 1600MA. I haven't used the 2000MA a lot yet as the swells have been pretty powerful. I did a D-Winger on it and was very surprised by how well it coped with Downwinding.
All the MA's can ride incredibly slow when needed without stalling. They also re-laminate very fast after jumps, sometimes resulting in a no board touch down on large jumps when you fluke a clean landing.
The best way to describe the MA is to say it is like putting on the traction control and lift assist on the HA. Great for freestyle, jumping, actually wave riding / surfing, prone foiling, Kiting on the 850 is crazy fun. The 2000MA is grunty and it is pretty cool getting that much area under 95cm of span allowing you to ride shorter masts and still turn hard.
The 850, 1000, 1200 and 2000MA are all AR4.4 whist the 1600MA is AR4.1.
Here's Naish's blurb,
"
The all-new MA Foil design marries the proven DNA of the successful Naish HA series with a medium aspect ratio ('MA') planform. The reduced span results in faster, more responsive turning while the global geometry delivers the perfect balance of early takeoff, roll stability, and pitch control at speed. The truncated wingtip concept provides the maximum possible glide for the reduced span, making manoeuvres effortless while significantly reducing drag for higher top speeds - the bluntness of the tip is also an important safety feature. The result is a foil that is both easy to ride and yet offers top performance for riders pushing the limits with jumping and manoeuvres.
"
Available now in all sizes at your local Naish Dealer in S26 configuration and the S26 C35 and C100 masts or in the S27 configuration with the new Mast and Fuselage connection with masts in Alloy, C35 and C100.
All MA wings are fully interchangeable with all Naish systems.
Get out there and give them a try, they'll definitely blow your mind at doing what they do!
Ride safe,
JB
.. I think this concept is great multirole weapons for a progressing winger who likes playing in small swells except for someone seeking max glide or pump (which should go higher AR HA wing). Only my opinion 
.. the MA is also thicker and found it providing more lift but less glide than the HA .. are still riding Armstrong mate?
.. still waiting for 18+knts and some swells 
HA1040 vs MA850
