Have had the case now for over a day and I do have a few thoughts about it. Purchased at a Verizon store last Sat(none in my area had it in stock apparently) for $48 with tax and 3 day shipping to my home. Color was the grey which I thought went really well with my gunmetal model. Upon putting it on the phone I felt that the fit was spot on. The back snapped right into place and the front flip cover rests evenly on the screen. Functionality of the case is second to none. It works as advertised ranging from being able to see time and current weather conditions to making and answering calls.
Some of the other things that will light up are any incoming text messages and you can also dismiss any alarms that you have set to go off by simply following the gestures. A big question that I had when I bought the case was whether or not that the music playback would be hindered. I'm very happy to report that audio playback was just as clear and precise as if the cover wasn't over the front of the device. Another plus is when you open the cover the phone automatically unlocks and the screen shuts off when the cover goes back on. Thus greatly eliminating use of the top mounted power button.
I felt the choice of the materials for the case were not bad. The rear material certainly doesn't feel like a cheap plastic by any means, but it's nowhere near as nice as the phone's metal finish. The most comfortable way of using the phone for me was to hold the cover with my left hand and use my right to operate the phone itself. Now, I have rather large hands so this could obviously be different if you weren't blessed with such a thing. Folding the front of the case back over the rear proved to be uncomfortable to me. Another downside is the fact that the front cover cannot double as a kickstand when positioning the phone in landscape. When done so, the phone just falls flat on its back.
Overall, I definitely like the case. It has that wow factor to it as everyone I have showed it to have been amazed by it's functionality. The only things that HTC should improve on it is to have the front flap being able to fold back and stay flush on the rear of the device. I also would had like for the front flap to stay open when you open, but the trade off is that when it springs back into position it does a good job of staying over the screen, even in a loose pocket. I noticed no addition use of the screen during the day in Gsam battery monitor. If I were to give it a score out of 10 I'd place it at an 8. Only major cons would be price and certain aspects of holding the device depending on hand size.
I'd have to tip my hat to HTC for coming up with the concept. If anyone has anymore questions about it feel free to ask.