In my working days, there used to be a saying we used, and the Air Force used on us: Emperical data trumps analytical data. This is why there are so many full scale aircraft tests for structure, aero, etc. Even at these levels, analytical data has to be proven. Many times it was found that the analytical data/analysis was not "correct". Tests verify! I try to structure tests that minimize variables as much as possible to get a "good" test, in real aircraft and models as well.
I became interested in the sharp HT LE's in the mid '90's. I built a new stab with a sharp LE on a take apart Impact in '97. This test replaced a removable stab with one the same size and weight. I tested it and found no significant improvement. It was dropped at that point.
Years later after I had switched to electric power, I became unhappy with the variation I found in HT effectivness in colder to warmer conditions. Either could be adjusted to quality, but the change was unacceptable. Once again I pulled out that same stab from '97, and installed it on 2 Impacts, and the second Predator. The change in each plane was remarkable. Tracking improved, turn and stop improved, the control feel was more linear. The second Predator was interesting as it had non linear flap mechanisms in it, and still felt more linear.
Since that test, I have built nothing but sharp LE HT's. I have flown a lot of other quality pilots planes, Nat's winners, and World Champ's planes, and as far as I am concerned, the 3rd Predator is the best plane I have ever flown. The control response is very linear, and corners can be executed at what ever radius you are wanting and willing to do. It still does nice rounds, and the turn and stop is perfect. Yeah, it took me years to get it there, but it is there now. There are several factors that have made it this way, but the sharp HT LE is a significant part of it.
As far as the wing goes, the wing LE is fairly blunt, but not as blunt as Brett's Infinity. My Impacts and Predators have a blunt enough radius as they are, and work just fine. Sharp wing LE's are clearly a bad thing. No argument there.
Bottom line for me is the sharp HT LE clearly works, and are on all my planes now.