I had a leftover 2.5" SSD drive so bought this "tall" NUC which supports that and it works great with only that drive.  On the "short" NUC you must use an M.2 form factor drive.  I like that this has a full sized HDMI port too - which really makes a difference as on older NUCs this mini-HDMI port would sometimes be problematic due to lack of high quality mini-HDMI adapters on the market.  I stuck this NUC behind a TV and use it for video conferencing.  It is plenty powerful for full screen, high definition graphics using Skype in multi-party video conferences.