It's really great to see HTC engaging in this way. I'm the developer of Go For Launch: Mercury which has a new Vive demo out, and is in review for Viveport (how about speeding up my application? ). www.goforlaunch.co.uk
Here are my thoughts so far..
I love the Vive, but I certainly hear what people are saying about comfort, it's around 100g heavier than the oculus (I think), but most of the weight seems to be right at the front. With suitable adjustment I can do a couple of hours play with it but man do I have a big red mark on my face!
Roomscale is amazing once you get used to making the most of it, combat in particular where you duck, jump, crouch, and move around your opponent is very immersive (and surprisingly good excercise).
The camera - never use it... would have prefered $50 less on the price tag than a gimmick. (and 50g less weight!).
Content is an issue for many but it's early days. I think HTC made a big mistake not making a dev kit widely available like the DK2. I, and many other developers, were denied access to Vive before it released, however I had an Oculus in my office 2 years earlier. This is why there is so much high quality content for Oculus, it's been in development for much longer. The dev kits also gave them a massive head start in dominating the market share.
Business practice... Steam/HTC is nicer than Facebook/Oculus (This might not actually be true, but Palmer Luckey has certainly screwed their PR!).