Well everyone who I've heard from has said it's incredibly good, and at the very least it's just a demo. Why not try it? It can be a bit jarring at first I found in the demo but after about 15-0 minutes you can really appreciate it.
Just don't try hard like I did.
Listen to this man, for he is wise. Hard mode will put you off the game if you dislike tough challenges. And the demo's Hard difficulty is nothing compared to the main game Hard's difficulty.
On chapter 3 bosses start having double HP and stats. Some of the battles are insane, even with a strong party
Current PC Build
CPU - i7 8700K 3.7 GHz (4.7 GHz turbo) 6 cores OC'd to 5.2 GHz with Watercooling (Hydro Series H110i) | MB - Gigabyte Z370 HD3P ATX | Gigabyte GTX 1080ti Gaming OC BLACK 11G (1657 MHz Boost Core / 11010 MHz Memory) | RAM - Corsair DIMM 32GB DDR4, 2400 MHz | PSU - Corsair CX650M (80+ Bronze) 650W | Audio - Asus Essence STX II 7.1 | Monitor - Samsung U28E590D 4K UHD, Freesync, 1 ms, 60 Hz, 28"