I played the older 2017 demo with 2 characters and really liked the gameplay and visuals. Great old-school feel, yet very polished to feel somehow modern and unique, with novel mechanics like the character-specific skills or "paths" when interacting with NPCs.

I also tried the new June 2018 demo for a few minutes as Tressa. It was fun but jarring with few interactable NPCs and very little in the way of introductory story or cutscenes, fewer than I remembered from the old demo. I wasn't sure if this was because it was still just another demo, so I've decided to hold off and start from scratch in the full game. (The save file carries over from the June demo to the full game.)

I would normally have preordered, except for my extended backlog from the Steam summer sale.

There's a review roundup on Reddit in /r/JRPG: https://old.reddit.com/r/JRPG/comments/8ybg3i/octopath_traveller_review_megathread/ -- looks like a lot of 8's and 9's with a meta score around 84/100.