Claire, there have been several threads on the choice of wind
gens, including Air X performance, over at the SSCA Board - http://ssca.org/sscabb/index.php
FWIW (and to repeat myself from another thread) we had several visits aboad a 35' Warrior while in the Channel Is. while their AirX was busy keeping the batteries up. Our collective heads were perhaps 10' from the wind gen and, as the reefer cycled on which exceeded the current
being supplied by the solar
panel, the AirX would cycle up to speed, generate for a while, the reefer would turn off and battery
voltage would again climb...and the AirX would spin down and stop. This went on repeatedly and no part of this cycle was intrusive on the cockpit
conversation, nor did it bother any of us.
One of the main features overlooked when choosing a wind gen is how 'smart' the charging
circuitry. To weigh an AirX against a KISS e.g., when one is fully independent re: battery
management and the other is unregulated, is a bit like comparing apples to oranges. Another factor is product support. With many wind gens, the retailer is who you must rely on if you need to resolve a product problem (which does happen). With Southwest Windpower (the AirX mfgr), they invite problem hardware
to be sent directly to them, they employ a technical staff to deal with them, and they also have offered upgrade paths for older models.
Be sure to think thru the entire system installation
and also product support before making your product choice. Fortunately, there are a number of good products to choose from.