The base game of Gloomhaven weighs 24 lbs. The experience system and campaign is just a joy to play. I call it fantasy ASL, because the card play and battles on the hex based dungeons are extremely tactical. I'm currently in two campaigns. Have played 32 scenarios with two of my sons, and 4 scenarios with a couple of ASL buddies. If your friends like ASL they'll like Gloomhaven.I always like your reviews of Euro games. I am trying to get my 50/ 60 year old group to try some of these. I believe you talked about Pandemic and I went out and bought that. Great game! Gloomhaven might be another.
Besides the base game you should get the removable sticker set, so you can remove the stickers and start again or play a second campaign. My oldest son bought it after playing it and he has played campaigns with his video gaming friends of which two of them went out and bought it. Both my ASL buddies bought it after playing it.