I'll be writing up a full report later, but here's the short version: fun was had by all! It was Scalegloom, and the dragon TPK'd us at the end (but damn that was a close fight and we hung on till the last breath - if we'd had 5 players instead of 4, I'm convinced we'd have beaten him). Plus a quick tour revealed that Esdevium has in its warehouse more RPG book and accessories in one place than I've ever seen in my life!
Charles was a courteous host and an excellent GM. He allowed a couple of players to switch characters partway through the adventure so that we could get a taste for all the classes/races.
Some things that I was dubious about thematically worked in play better than I expected, and mechanically we found [combat] to be much more fluid and mobile.
Anyway, detailed report later!