i think it's sort of hit or miss with their stuff, unfortunately it's been mostly miss for me, but the same sort of quality issues apply with lots of other brands too these days.
i just had a read through that corsair 760i review i linked to earlier and it seems like for the most part the 760i is good quality, the only issue the review reported was the caps used "Right next to the main transformer, we find a group of CapXon polymer caps used for filtering the +12V rail. We would highly prefer Japaneses caps here instead of Chinese caps, but Corsair must be pretty confident about the lifespan of these caps since they back the unit up with a seven-year warranty."
I would have just stuck with the 750 myself since those are made by Seasonic and the sweet sport IMO since the 750s dont seem to have the same whining problems the 850s do, but since you've got a 760 now and it matches your color scheme i wouldn't be too worried about it!
This is what they had to say about the new manufacturer
"The new AX760i and AX860i are manufactured by Flextronics; the same company that produced the AX1200i. Flextronics is, although they don't have a significant presence in the desktop PSU market, still able to produce products that can easily compete with the more experienced competition (Delta, Seasonic, Enermax etc.) Like its older brother, this unit utilizes a Digital Signal Processor or DSP instead of a conventional PFC/PWM controller and a supervisor IC. This allows for the best possible performance since the DSP is much faster than conventional ICs. DSP makes proper adjustments right on time and does, on top of that, take into account many more parameters. An LLC converter on the primary side and a DC-DC converters, for the generation of the minor rails on the secondary side, further boost efficiency. The unit does, all in all, use the best technology available for commercial PSUs."
Source:
http://www.techpowerup.com/reviews/Corsair/AX760i/4.html