Nabbed one this morning at Best Buy during my off-work "appointment" (If my job ever starts asking for doctors' notes, I'm screwed). Actually 2, one for me and one for the wife.
My goodness, it's like a freaking breath of fresh air. No lags. Perfect, and I mean PERFECT, pdf viewing/annotation.
I love Android's ability to tinker and customize, but honestly, the iPad is just a huge step ahead of everyone else at this point. I actually prefer the 4:3 aspect ratio; it's easier for me to read. The 16:9 is nicer for videos, but honestly I watch all my videos on my Note 3.
Dammit, Samsung, why tease me with the S-Pen and then give me the lag?
Ugh.
And the aluminum really is nicer than the plastic, I have to admit.
So my conclusion, in my own very biased but heavily-tried-and-true point of view, is that the Note 3 is the best phone out there; blows the iPhone out of the water. But as far as tablets are concerned, there is just no contest.