Ran this with a party of 4 in High-Tier. Lots of good role play opportunities, a wonderful amount of story and lore that the players get to find out, and what an amazing set of encounters. Would definitely recommend playing/running this scenario.
I ran this for a table of 6 earlier tonight, we ran low tier and had a blast. The lore was super interesting and the combats were fun. Lots of roleplay opportunities, and the final boss was really interesting and cool. I would definitely recommend this scenario, myself and my party had loads of fun.