The Atomos Shogun 4K HDMI Recorder is continuously becoming more and more popular with more cameras supporting clean HDMI signals. Instead of your camera recording to a compressed file to an SD or Compact Flash card, the feed is recorded in the Shogun to a variety of high quality formats. Aside from just being a recorder, the Atomos Shogun is an amazing full featured high resolution monitor with waveforms, peaking, zebras, and more. The fact that it can see a 4K signal also makes this ideal to monitor from such cameras that only output 4K where other monitors won't work.
At almost $2,000 dollars, I think the Shogun's ability as a 4K Recorder, Monitor, and Audio Preamp makes it worth every penny, but it might be worth spending a few bucks more for the PVGear KavalCage system to protect the Shogun during use.
Rik Cordero of RunPlayBack.com gives us a little insight on the latest Atomos Shogun Firmware Update that now offers downscaling to 1080p on the HDMI output. The Atomos Shogun is primarily a video recorder mounted with the camera, and so this downscaled output feature is especially handy when you have to share the feed to a director's monitor (most people aren't working 4K monitors yet). The Shogun also now supports previewing 3D LUTS which allows you to get a better idea of your final grade so that you can set better color and exposure while recording.
Most of the cameras i'm capturing 4K from outputs via the HDMI port. Obviously, a few things I'm always worrying about is cables being pulled loose during production, or possibly even damaging the HDMI port. I've managed to do this on a few monitors already (including a SmallHD, and on a GoPro HERO3). I'd feel more comfortable if the Shogun HDMI had some type of protection.
The Shogun is still fairly new, but fortunately two companies are already working on Cage solutions for the Atomos Shogun. Any person who currently owns or plans to own the Atomos Shogun 4K Recorder should be interested in these new products.