I've never really had wifi or pen issues (just one minor glitch each) the one I could vote for was <6h battery life, but to be honest for me this isn't an "issue". I don't mind it, yes it would be great if it was more, but to be honest, my nexus tablet probably didn't last much longer in constant use and it is capable of way less and has a much smaller screen to light up than the Surface so I'm pleased with 6h, it's way better than any laptop I've owned before on battery life!