Amazing stuff. Not much experience with buying authentic szechuan peppercorns before, but this is definitely a unique flavor. Adds a great deal of lemon, in addition to the unique numbing/spicy sensation. Currently working on a chili featuring this stuff, but so far the lemon profile has been a turn-off for the wife.
*Note: If it's your first time cooking with this, use small amounts. It's very potent; over-killed about a 5 qt pot of chili with a tablespoon of it. I would suggest actually sauteeing it in butter, then straining out the peppercorns. Use the butter for seasoning/cooking and you'll get the flavor without the grit and pungent kick of the peppercorns (just try biting into one of these).