Well, I'm a bit late to the party, but I've just played the demo, and it was very nice. Extremelly pleasing aesthetically, and it was cool to have a fully voiced game - and even cooler to have a voiced MC - I really dislike when they are mute.
I wish the demo had a couple of choices too, so you can see various interractions with each character, but that's not a major issue per se.
As for the characters, well, I like them all, though none is one of my "types", sadly. I mean, as I said, they're all enjoyable anyway, but I don't have a huge crush on anyone. My favorites are Jeremy and Jaiden, but I have a hard time deciding who I like the most between the two. Maybe Jeremy if I had to choose. Well, the good thing about not having a huge crush on one of them is that I'll probably be able to do all routes. Sometimes if I like a character too much I can't force myself to do any other route than his.