The headset is fairly comfortable, the cable is certainly lighter and less noticeable than on other headsets I've used. It works well in my dark apartment without the need for tracking stations. The range of tracking on the hand controllers is fine, I've not noticed them go out of tracking yet.
The MR home/application launcher is reminiscent of PlayStation Home. You can access the store as well as web browser, skype and video playback from screens that can be deployed around the location. And yes you can stand on the counter tops ( just like PlayStation Home).
So apart from the shenanigans detailed below, I'm impressed so far. Now to make some content! :-)
More Cables Needed
If you have a laptop, you may need a Display Port to HDMI adapter as well. There is a list of supported adapters on Microsoft's website.
It is worth noting that the controllers need AA batteries and none are supplied. I'm using rechargeable ones with no problems.
WiFi Vs BlueTooth
Your notebook may share Wifi antenna with Bluetooth when connected to 2.4GHz access point. Check from device manager if you can switch band preference to 5GHz. If 5GHz network is not available and performance is severely impacts consider using Bluetooth dongle.