We've been having a local campaign to use in conjunction with the Nythera event lately, and I'm really enjoying how well the campaign system works. The upgrades (skills and equipment) are very fun, but it's hard to go over the top with them (at least so far), while the risk of injuries makes me put a lot more thought into how I build my crew.
Looking forward to seeing how well my arsenal of models is going to turn out, and I still have no idea what master I'll add when we're halfway through. Right now Mancha Roja is my leader.