Ran this for a party of three (Druid, Ranger, Fighter) and found it went very smoothly and we all really enjoyed the adventure. Information was very clearly laid out which meant I had minimal prep work to do, and all of the problems presented allowed for some very creative solutions from the players, and it never felt like anyone was forced into any specific route.
I was a bit concerned about how the final battle would go but even with a small party it went fine. They didn't realise the connection between the giant & mountain until the final battle but they all appreciated it and especially enjoyed the escape sequence which included a Gnome tobogganing down the leg using a previously retrieved insect chitin plate, a highlight of the session for me. One of my players is a nurse and she enjoyed how the Gelatinous Cube fight was basically killing a phagocyte cell. Overall a great fun, high quality and easy to run adventure.