While I don't bother about in-build power switches so much since I always switch off/on via the main wall socket anyway, but it's a nice addition to cater to everyone's need, which is especially expected in these kind of high-wattage PSUs. When we talk about 1.5kW, compromise is what people would reluctantly want.
Judging by the actual results of the PSU, I think "80+ Silver" should've fitted nicely with it. That way, it wouldn't defame "80+ Gold" Standard
What I mean actually is, it's barely holding on to the 80+ gold standard. While it doesn't actually translate to significant deal breaker, it's somewhat disappointing to see 550W-approved things in this 1.5kW unit.
However, the PCB neatness certainly gets my thumbs up. Among the most units I've seen from different distributors and OEMs, this one looks very neat (apart from the gooey use of solder there, Ewwww!), components are arranged very nicely, and there aren't any glue (or whatever you wanna say them) oozing out from or underneath heatsinks and FETs.