Without a doubt Gigabyte is a key player in IT manufacturing with great success in the motherboard and VGA market. So it is not surprising that many overclockers out there praise the company at every occasion. This is also why I had big expectations from Gigabyte's new Sumo PSUs, even though older Gigabyte models proved to be not so great performers. After completing this review, I am a bit disappointed that the Sumo Power 900W simply could not impress me.
Its strong points are certainly the large number of connectors and the good efficiency with higher loads. I also saw nice results when it came to ripple suppression on the minor rails. Last but not least, the craftmanship is of high quality, comparable to Delta and Seasonic.

Unfortunately I was disappointed when it came to efficiency at loads below 60W, and ripple/voltage regulation on the +12V line. The cooling fan also tends to be quite noisy, Gigabyte should have used a 140 mm fan here, instead of a 120 mm one.
Gigabyte is not the only one to blame for this. I suspect that the platform provided by Acbel Polytech is not as competitive as they'd like it to be; and Gigabyte didn't insist on improvements. Competition in the PSU market is fierce nowadays, especially when it comes to gaming and enthusiast products.
Since Gigabyte has a long history in the IT market I am pretty sure that, if they pay the necessary attention to their PSU products, they will eventually come back with something really competitive. Till then I will be patiently waiting along with all of you.