This is a good buy, Corsair's products are generally good quality and this is no different.
Although not modular, the wires are all braded with generous lengths. The cooling fan is virtually silent and almost the full 650W is available on the 12V rail. Don't make the mistake of buying cheaper PSU's as most of these seem to have a rated value, but the most Watts tend to be on the +5v rail, which is virtually useless.
This Corsair has the power on the 12V rail where it is needed.
All black, with what appears to be a to class powder coat or quality paint job.
I can not fault Corsairs PSU's.