I like it a lot. I love the spell and monster formats. I love what they did with advantage/disadvantage (that will influence player action much more than a +/-2 modifier ever did), and I'm glad they decided minor stuff like drawing weapons, opening unlocked doors etc. was just free as part of your action. I also like the way your move can start before your action and continue after it. The at-will cantrips which are pretty much reflavoured Xbows work for me too.
I did notice the wizard and cleric both had a 2nd level ranged attack spell which seemed almost identical in all but name - same damage etc. Not keen on that. Also not keen on the "any healing takes you up from zero" thing; mortally wounded one minute, a tiny poultice and you're running around the next.
Glad to see subraces for elf, dwarf, and halfling.
The contests mechanic needs clarification. If both are attempting a task which either could fail, the rules as stated say the higher roll succeeds, even if it would normally fail. Say, both trying to climb a wall or something. First to open a jam jar.
All in all, I'm pleased. I know it's far from final, but it's going in the right direction for me.