We have 2 at work, currently out for testing with two co-workers. There are several different tablets we have to get in users hands to see what they prefer:
Microsoft Surface Pro 3
Lenovo Yoga 12
Asus Zenbook ux305fa
Latest to arrive was a Toshiba z20t earlier this week that looks very impressive. Obviously, it is the priciest of that group, but it also offers more to it. Think of it as a Yoga with a screen that will detach as well as flip over like the Yoga. It locks in very cleanly, and appears very solid.
General thoughts/impressions from the people testing them out:
Microsoft Surface Pro 3 - thick stylus, easier to write with it, but no place to put the stylus when done with it. Smallish keyboard that doesn't give a fast typist any confidence.
Lenovo Yoga 12 - thin stylus that hides internally, but harder to hold. Better keyboard, but durability is a concern.
Asus Zenbook ux305fa - solidly built aluminum shell. Super thin, but retains rigidity. Fingerprint magnet.
Toshiba z20t - no data yet. I just wiped Win7 off of it today and installed Win8.1, as we
will be moving to Win 8.1 for all of the tablets that we buy this year. It's probably my favorite out of all of them listed simply because it doesn't seem to skimp on anything.