It does cut 5" high density foam but its not as easy as I'd hoped. There is a definite knack to starting the cut (i.e. to get it to slice - else it produces a rough cut). The cut needs to be one the right 'line' the first time as trying to take fine slithers off doesn't work.

Its bigger than I expected but don't have anything else to compare with it. The blades look very sharp & probably cuts meat very well - its intended purpose.