Yeah, horde is pretty fun. Played with willard and NRP yesterday in a public match. Got up to wave 30 on Hotel. I still haven't quite figured out the cash sharing.
I played with RobertR1, NRP and a guy I play NHL with in a public match and we got to wave 38 or so on Sandbar. Pretty crazy stuff. Haven't figured out the cash sharing either. I just read a guide that said you can walk up to another player and press Y to swap currency.