http://v4musclebike.com/forums/showthread.php?t=2876
Thanks for the link, Chad. The newer MOSFET design should dissipate substantially less head under light load conditions. Under heavy load there probably won't be much difference in dissipated heat -- but it also appears to me that this unit has more heat dissipation capacity, since it looks to be a bit larger. (I would hope the thermal design is improved over the "bucket full of ickumpuckie" in the cavity of the stock units!!)
I would imagine that this unit will have better reliability than our old designs, which appear from the posts to be the most troublesome feature of our Magnas -- certainly of the 3rd gen ones. I would still mount the unit somewhere other than under the battery box, though!