I played my first game with Beyond last night, on an iPhone. The interface worked very well, I'm excited to try it on a tablet. The top bar did disappear a few times which was irratating. I think I was faster then when I used my paper character sheets in the past. I'm not the most organized player, tracking hit points and spells was great.

I'm playing in a Curse of Strahd campaign and came under exhaustion, I didn't see a way to track levels of exhaustion. Also I encountered a Gray Ooze and my half plate lost 1 point of AC. I don't see any way to record that. 

Mmmm I believe you can't track the effects of the Gray Ooze. The conditions, though, can  be tracked. Click on your hit points in the sheet.

I could track one level of exhaustion there. Additionally it appears that exhaustion has no effect on the character sheet.

Oooh.  I see that.  Good catch.  It has only a minor effect on the character sheet tool, and should be completely up and center since having that status effect (or almost any status effect) is a pretty big deal and is infrequent enough that it often requires reference back to source material to understand the implications.

This is a really good point, being able to track exhaustion and item damage doesnt come up that often but when it does it would be very useful to track