IPV6 planning

Hiya, We are currently considering deploying IPv6 for a Lan event in April. We are assigned a /48 which we then split into smaller subnets for each player vlan. That said, what remains to be decided is how we are going to assign the IPv6. Basically, it seems that are two ways, one SLAAC where the endpoints uses RA to generate it's own IP and DHCPv6 which is basically DHCP but for IPv6. Large events like Dreamhack have used SLAAC and the feedback has been mostly positive. Can anyone comment regarding past experiences with IPv6 gotchas and things that you don't really expect when running dual-stack on a large-ish network? Thanks! Laurent