Don't really know how valid this comparison is, as it is far from scientific, but I am aware of a dozen or more '07 110's that have been immediately modified upon delivery to avoid the high temps and critically lean AF condition. These bikes, ranging in mileage from 1k to over 10k have experienced no engine failures. It would seem to me that the "EPA tuning" is the primary cause of the failures since an inherent parts failure would certainly evidence itself under both engine setups. My feeling, for what it's worth, is that the factory setup on the 110's is the root cause.
My guess is that a choice needs to be made upon purchasing a new 110 to either worry about the standard warranty or resolve the problem and avoid serious and extended downtime as engines are replaced. From my perspective, I'd rather forget about the warranty and not have to take the bus home from trip while the bike was sitting at some unknown dealer waiting for parts. Engine wise, I think we all know that a properly tuned and maintained Twin Cam is literally bulletproof if set up correctly. Putting it in this condition MAY under some circumstances void the engine warranty, but will have no effect upon the other expensive aspects of the warranty such as electronics, paint, peeling chrome etc. Doesn't seem like much of a trade off to get rid of cooked a$$, marginally reliable motor and a scoot that won't get out of it's own way in factory trim.....