NERO is the larp I play in, in case you care to know, heck there was even an article about it in Dragon Magazine back in September '91, when Dragon was more than just a solely D&D magazine...
NERO was fun enough- I didn't actually LARP in it, but I did do some sparring and weapon design when I lived down in Austin in the early 1990s. I got involved in it maybe a month or 2 after the Dragon article, as it so happens.
I still have my weapons, but nobody to spar with. They're pretty tatty now, but I still enjoy reminiscing about how my longsword was perfectly balanced, how my spear had a crosspiece below its head, how my greatspear was effective against a 300lb professional bouncer using 2WF, how my finely-crafted battlaxe came out at the historical weight for such a weapon...and hit like it! And how much fun my interpretation of the Batlef was to use.
Good times, good times.