I ordered mine back in Dec 2015, so i have been using it for almost a year. my spec is almost the same as the review unit, with a few exceptions, ECC ram, 256GB SSD, no smart card, lower capacity battery.
It has been a wonderful workhorse. very dependable as a desktop replacement with rare occasion of battery usage. most of my uses are graphics design and presentations, with some video rendering here and there.
and yes, i have the same issues with sleep mode or on some occasions when turning on, it will stuck in boot/black screen for 10+ minutes. I'm not 100% sure what causes it, but i think it has something to do with external attached storages/accessories.