Summary: I loaded Win 7 x64-SP1 and all the drivers from Intel's website. Make sure you update the Bios also. Works great and is smaller than I thought it would be...about 3 iphones stacked on top of each other. However, it took me a while to get the OS loaded because the SATA power connector on this board did not have enough power to run my sata dvd drive (wouldn't open the drive door) and I tried 2 different drives.
Summary: I love this thing ! It's blazing fast, ultra compact and decoding video is suberb. Only reasons I didnt give it 5 stars is that Intel needs to add a power-on via keyboard option (you can only wake it from sleep, not power on via keyboard) and that it's still actively cooled (I always prefer passive cooling, although I must say the noise the cooler makes is very faint).
Summary: I guess the latest processor justifies the high price. This unit's video is wonderful. It is very fast running Windows. I added an 8-port USB hub to attach all my stuff, all of which works fine. Recommended, especially if space is tight.
Summary: I successfully installed the 8gb single ddr3 ram (will eventually add another 8gb in the future), the m-sata 240gb, and the ac7260 wifi + bluetooth. The biggest challenge for me was trying to attach the two grey and black antenna wires onto the chip. I was eventually able to get it in. Using this as a HTPC. On first boot set up, I forgot to make changes to BIOS but it didn't seem to matter as it was able to successfully install and boot into windows 8.1 anyways.
Summary: I setup my NUC with 16GB of PC3-12800 Crucial Ballistix RAM, a Muskin Atlas mSATA SSD, an Air Live X.USB-3 wifi adapter and installed Fedora 20 Linux. All the hardware was correctly detected and pretty much worked upon first boot. In addition, I installed windows 7 inside Oracle Virtualbox and had no hardware issues with this either. Finally, I booted with a Clonezilla live CD for full disk backup imaging and again had zero hardware detection problems.
Pros: I am using this as my streaming HTPC in my bedroom, and it's perfect, small form factor, doesn't run that hot, and EASILY converts up to 24GB HD video files on the fly (probably even bigger than that, just don't have any video hiles larger). Can't give it 5 eggs though, see my reason under "Cons."
Cons: I did have one unit that came where the WiFi did not work (almost no reception right next to a wireless router); the bluetooth worked, but the WiFi did not. I ruled out the Intel Wifi/Bluetooth Adapter by using my buddy's adapter, and there still was little/no WiFi signal. Sent it back to NewEgg for the no-hassle return.