Not a £45 game! buy on sale. reasonable price is £20 or below IMO
It is semi full coop. I play all these games with my mate. One hosts and has progression the other apparently doesn't (in game warning). So far...we have no idea why the warning (fully coop). You want to play full coop campaign with a mate your'e good. Want to play coop, mate gets bored and you wanna finish solo- that might be a problem with character progression. It's fun and you progress is balanced to hosts game with the money you collect; which is used to buy perks, being saved when another hosts. It saves builds between game if you crash, which we only had once opening a chest.
Added bonus dialogue at times is hilarious,
TL;DR- semi coop, plan to play fully with mate for no issues, builds saved, funny script, solid game. Worth it on sale