It's a battering ram!  I'd guess it would hold up to a warn 9000 series winch - I have a Warn M6000 on my Calmini bumper, which costs about the same amount, looks a lot better, and fits a lot better.
EDIT:  I take that back!  The ARB is $700, and the Calmini is $500 - and is a LOT nicer!
BUT - it's more than looks you should be thinking about!  That big massive hunk of steel out there cuts down your approach angle - the Calmini unit will give you a better approach angle!  I don't think my Kick on 31's could make it through the Golden Crack with the ARB Bull Bar, but it didn't TOUCH the front bumper to the far side of the crack with the Calmini bumper!