No problem here either. I've been using it for the last five days,... a lot! before I packed it back and wrap it to place it under the tree earlier this morning... 
The K1 is a great tablet, very responsive, well designed with a solid built that feels well into your hand.
The only problems I had were apps related: Netflix that needed to be de-installed before upgrading and I noticed a few apps not rolling from profile to landscape, but these are not UI or HW related problems. I had not have any of the sleep related problems that required a reboot, and all updates to 3.2 worked flawlessly.
Today, the K1 has almost been used non-stop as everyone wanted to check it out. We have played Netflix, Rhapsody, Pandora, visited countless web sites, used email, Facebook, etc and everything worked fine. My daughter who has her own iPad at school likes the UI better on the K1 and finds no difference to the responsiveness of the touch screen. She finds the iPad lighter but not significantly much, and likes the feel of the K1 better, feeling more solid with a nicer back and edges. The K1's screen looks better. She finds the position of the buttons on the K1 a bit odd but probably a matter of getting used to.
Wireless was a breeze to set up and the signal was not different to the two laptops we use in our house.
I will report again in a few days with more details, but so far our Ideapad K1 gets a five star review from our household.
