Alienware's SteamOS version of the Alpha. This machine is pretty capable at running your games that are compatible with Linux at 1080p quality. It contains some hardware that, can be argued, is better than the current gen consoles. It has some upgradability in certain parts like the RAM, storage, and can even run Windows if installed. The big downside is that neither the motherboard nor the GPU can be upgraded since both are integrated together. Overall, it's a small form factor that can fit almost anywhere in your home and be sitting proudly next to your other consoles.
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Pro R2 variants have reasonable GPUs
When you get away from the base model of the R2 variant and pay higher for the other I3 with 1 terabyte, the I5, or the I7, you're dealing with a GTX 960 that packs a bigger punch than the base model's custom GTX 860M. It can last you for awhile until you need to upgrade which is possible with the supposed hidden amplifier port.
Pro A reasonable price point
The R1 models are now on sale and can cost $300 for a base model I3 and $500 for the top of the line I7. The R2 versions, although a bit more expensive, still make it in a range that people can afford the machine to be in their homes alongside their Xbox Ones, Playstation 4s, and Nintendo Switches.
Pro The R2 model may have an amplifier port
There have been posts claiming the R2 version of this system does support an amplifier port like the Alpha R2 but is covered by the plastic casing. It can be cut through but that will void the warranty. You could also take off the chassis entirely and use the port that way but that will look ugly and can attract dust. If you don't mind cutting through the plastic or remove the case to use the amplifier port and get yourself a desktop quality GPU then by all means.
Pro User replaceable components
The CPU, RAM and hard drives can all be replaced by the user meaning the machine can be upgraded easily. Sadly the GPU cannot be replaced though, so keep that in mind.
Pro Good form factor for living room
The box is quite small, a lot smaller than an XBone or PS4. It is square shaped and looks like many other set top boxes meant for a living room. So will fit in quite nicely with any other peripherals being used for a TV.
Con Under-powered GPU
The GPU used is the equivalent of an 860m, which is a mobile GPU fr laptops and when compared to GPUs for a desktop is pretty under-powered. So many graphic intensive games may have trouble holding 60fps at 1080p
Con GPU can not be replaced
Sadly there is no way to swap GPUs (like a regular tower PC) and so will detract from the longevity of this device.
Con Controller does not turn on the system
Unlike regular game consoles the Steam Controller is unable to turn the machine on. This means the user will have to get up and press the power button on the actual box, which may be frustrating.
Con Steam OS
This box comes with Steam OS as the operating system, which is based off of Linux. This means that there is less support for games and has a much smaller library when compared to Windows.
Con Steam controller dongle is weak
There is a hidden port where the Steam Controller dongle is placed in the machine, this obstructed eye of sight gives issue with the connection to the wireless controller when used past 10 feet. Luckily the dongle can be moved to a front USB port on the machine, which does help.