I had one unit for review in early November. That unit had some issues with the capacitive Windows key, weaker than desired 5GHz signal strength, and on screen keyboard performance. A full refresh eliminated some of the issues. Standby battery life was so so.
My newer unit that I just got this week has substantially better 5GHz signal strength and throughput. However, the on screen keyboard can be very troublesome. Other times it is not too bad. The capacitive Windows key is better once you get used to it.
I am hoping a firmware or other update can help with the keyboard. Calibrating and regedit hacks don't work. The recent battery hot fix seems to have worked for the battery. I have great standby time now.
However, it also has issues shutting down properly. It'll look kike it is off but it never really shutdown. Only witnessed during a restart.
I am doing to try the Dell but it is less appealing to me than this Lenovo. I like having the lightest and thinnest tablet of the bunch. The Toshiba is too heavy and the Acer not yet shipping.