I received NVR from that 1st linked vendor (vgood/7days total to US btw), DS-7108N-SN.
On 2.3.6 FW, English ONLY
max res seems only 1080p, i tried setting 2032 cam to 1500p, nvr lost signal.
NVR is nice, but this fw lacks things like SINGLE FRAME +/-, and a few other very nice to have features (digital zoom is there but weak/disorganized, seems half implemented, not sure if this it tru on all Hik NVRs), Playback CALENDAR click didn't select correct date, i had to drag thru every day to get a week back.
but for $100+HD! sold me (was on aliexpress sale 20 off 200, bought 2).
Make sure your cams are supported, and go for it IMO.
Since there is no fan in this unit, u might consider low power(cooler) 5400 rpm drive like WD RED, unless u can find PURPLE/YELLOW cheaper. Should be no prob to handle 8 cams / 50mbps (which is 7108 limit, I think 7608/7616 only have 40mpbs limit!)
BTW, older firmware had probs working w/wireless USB mouse dongle, 2.3.6 works fine with K400 Logitech wireless combo. Double finger drag (mouse wheel emulation) scrolls NVR Timeline in playback mode (which you'll need, as the calendar on mine wasn't functioning).