Got it from Best Buy, more than a month ago, so I'm SOL. Seriously considering selling the thing (I do love it, honestly) and getting the Acer... but I'll probably stick with what I have. I'm 100% sure the Dell has better color quality and I've heard too much about Acer's QC issues; that matters a lot to me. I've never even seen Gsync working, so as long as I keep my head in the sand I should be alright.
Their normal return policy is 30 days but they may have an extended holiday return policy in effect depending on when you actually purchased it. Just saying. You may have time to purchase this one and test to see which you prefer and still return the Dell.