HF is much softer and stickier. It does indeed wear off a bit quicker, but it still takes 4-5 days a week for 9 months to go through the toe.
You know how C4 gets that sort of glassy look after a couple of months? Mainly I've seen this on moccasymms, not ansazi laceups or velcros. HF never gets like that. Since its so soft as well you can REALLY feel the rock. You can put your foot on a little granite crystal and feel that suckah.
I think right now the only shoes offered with HF are Dragons (discontinued but can still get them from 5.10), V10s (these shoes are the shit for steep sport and bouldering), and T-Rocks (lace up shoe, liked mine a lot but they ripped so 5.10 is sending me a pair of Anasazi Lace ups).
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Rudy thinks the ansazi lace up is the best shoe ever made.