According to PC World  David Dedeine has overseen development of the HoloLens games Young Conker and Fragments, so he's one of the few people to have obtained meaningful hands-on (or heads-in) time with the HoloLens.

While he praised the physicality of the HoloLens experience compared to standard VR, as well as speaking of reduced motion sickness he was a little worried about the head problem.

Unlike other VR headsets, the HoloLens essentially crams a complete computer into the headset, which means that there's a heat-emitting CPU within inches of your skull. Microsoft is aware of the issue and has designed its HoloLens to shut down a game if things get too hot.

As for other possible issues, like the HoloLens's limited field of view, Dedaine says that they're nothing to worry about.

"People make a big deal about the field of view on the HoloLens, but for real, once you get used to it, you don’t think about it any more," he said.

 

Neither is the system's three-hour battery life much of a worry, Dedaine said. You wouldn't want to spend any longer with the device in a single sitting. Presumably because it would microwave your brain.

Dedaine was mostly positive about the HoloLens which he thinks heralds a field of immersive gaming that's beyond VR.

"I say that there is a continent of gaming, and VR is just a new peninsula on that continent. AR is an entirely new continent," he said.  However it does seem that Microsoft has a bit of work to do on the heat issues.