I purchased an M12D SS-850 back in Jan/2010 and since then it has lived through about 50 power outages thanks to my awesome apartments. Of all the components that I've owned since then it's still running my main rig. I purchased an X750 to fix a friend computer after his Ecowatts died. And I recently grabbed an X400 so I could go full modular in my Lian Li PC-Q25B and free up some valuable space. You power me Seasonic and there is no one else I recommend to my friends.
Thanks for the opportunity! I've always loved Seasonic power supplies. I've used them in the field (building servers, whiteboxes) and the failure rate for Seasonic is quite low. I won't name other names, but I've found them to be quite durable when compared to other brands that have a "better" name. Also, the price for this unit is quite reasonable! Gotta love a company that values quality as well as affordability. Fairly uncommon.