I don't think it is possible for a blade to cut all arm hairs mid stalk in one pass.
As for the HHT, this video shows how it should be done. Blade motionless, bring the hair to the blade, and test multiple areas of the blade. I do at least 3 places, heel, belly and toe, but ONLY as a quick edge test, the only true test is to shave with the bloody thing.
[YOUTUBE]http://www.youtube.com/watch?v=xM1V3Je4zUI[/YOUTUBE]
That looks a lot more reasonable than trying to cut every hair mid stalk .
I agree too that the shave test is the most important. I could care less what some test shows, I'm only interested in real world performance.