We tested a model with 4 GB memory, Celeron J1900 CPU, 500GB disk and Windows 8.1. For some reason we got two different models, one with an additonal nVidia graphics chip (EB1037) in combination with the built-in Intel one, and one without. (EB1036)
One word of advice: these units come in a lot of different variations (so check the model number) even if the exterior is the same. The previous generation is visually identical, but come with Windows 7 (though that's fine) and far weaker Celeron C1007U processors etc. So make sure you get the right one, and not the outdated version.
For digital signage use however, we didn't notice much variation between the nVidia and non-nVidia versions. All in all we're very happy with the performance, they are small, affordable, well-built and easy to install. They will (assuming you get the latest model and not the old one) play Full HD videos just fine, and with some headroom to boot.
Quite possibly our favorite low-end player at the moment, even if pretty "big" compared to the yet-to-be-released Intel Compute Stick.