Quick google shows that it's an old design (2.5 years at least), overrated on power (840w on 12v rails, same as the HX850 I think) so its really a 850-900w PSU in reality, has weird 12v spikes but generally good voltage regulation, pretty inefficient (77%ish at 320w), and only has an 80mm fan and a very dense inside so I'd bet when pulling a fairly high load out of it, it could be pretty loud
Meh, you could probably do better. If you really need a "1000w" PSU you need to spend more, if you don't, I'd get a better quality newer unit at a lower wattage