Been a long time since anyone posted anything on these, but I'll chip in what I found. It's basically exactly the same as Haste Belt, except it goes on your legs. So:
-Enchantment lasts 3 minutes, and grants 10% haste
-It wears off if you switch the legs, or if you zone
-It recharges every 20 hours
-It stacks with Haste Belt, and the spell "Haste"
-It does not count as gear or magic haste with regards to the 26% gear haste and 43.whatever% magic haste caps, and it does not bypass the 80% total haste cap
It's pretty much only good for kclub/mkris/oclub zerg, but it seems very good for those.