Iron helm seems to be a game that benefits more from expansions and iron chest is a great one! I'm definitely a fan of this game but I'm not sure how much I recommend the base game alone. This expansion would also need 2 other expansions (but ideally closer to 5 or 6) but iron helm is a great solo game that you can play in 15 - 20 minutes, with a full campaign taking an hour, hour and a half max.
Board game bliss had great shipping and the product arrived without issue. Would recommend if you're on the fence but own iron helm already :)