49clipper
Steve,
I installed one last year and have no compliants. I have about 50 hours on it. The claim was I would get a lower idle (if wanted), lower fuel consumption, get more LOP than i could with my mags, and better starting. I can say for sure, I did not need a slower idle (mine is fine already), I may be getting slightly lower fuel consumption, but if so, its so slight, its hard to tell, I can definitely run lean farther before onset of roughness (approx 45-65LOP), starting is the same (my engine has always started just fine at one or two blades. I have a O-320-D1A, with carb. My normal fuel consumption from the day i started flying it is 7.2 gph and it still seems to be right there. I fly LOP on virtually every flight. the one drawback which is completely normal is that your CHT's will rise about 30-45 degrees with the advanced leaning. that is not a problem for me since I typically run about 275-315 degrees normally. Now i run about 290-340f.
I will never be without a mag, period. Its a matter of trust and simplicity.
Would i do it again, hmmm. good question, I don't know.