Ok, having made a couple of characters I've noticed four things:
1. It'd be nice if there was a bracket for your proficiency level in the Saving Throws box, similar to how Perception has it.
2. There's no armor proficiency area. Don't have any recommendations on where that would fit, unfortunately. Maybe somewhere on the second page.
3. It'd be nice if there was a page with more spells boxes so you wouldn't have to print out multiple of the spell sheet to fit all your spells. A page with just the "Spells" box would be great.
4. I still prefer vertical sheets, but I am happy with this one so far.