Bought the Nightjar NJ450-SXL for my first build as I really liked the fan-less design. Very heavy & appeared very well made. Did cover my entire ITX motherboard when mounted above in my 678 case. Really too large & heavy for a SFF design. However it died 1.5 seconds after turning it on.
Returned it for a conventional EVGA 450 watt SFX PSU with no-fan-spin SFX size that uncovers about 40% of the MB for better cooling & weighs less than half as much.