Which model are you looking at, specifically?
CyberPower (and similar) typically cheap out on components such as the PSU. It's "fit for purpose" initially, but longevity & upgradeability would not be their strong suits.
Without knowing the specifics of the system you're looking at, it's impossible to say for sure whether it would run overwatch well. Something truly "worth" $600 should be more than capable, but a "$600" CyberPowerPC isn't necessarily 'worth' $600.