Rx580Issues were with the old CX series.
The CX650 is a pretty good PSU in general, depending on your needs.
What are the specs of your system you intend to use this PSU in?
Should I go for the cx650 or the cx550m cause they're gonna be around the same price on black Friday.You could even go for a CX550, the CX650 is plenty for that system.
The old CX 600w units were not good, but the newer CX550 and CX650 are far superior and very reliable.