i wouldnt buy one of those things Ian mate, the eyes are terrible and on the whole it screams cheap n nasty to me.... stick with your sculpted job bud.
But thats taking nothing away from Ian's continually great work - his Ben's are gruesome, awesome and original! - I'm just saying that those head props actually are a good base to work from for the keen customiser.
As Ian points out, they were "discovered" a while after he finished his great sculpt.
For those who do not wish to put a ton of modification work into the prop, Frosty's are totally the way to go - they really do look superb in person and you'll be dealing with a nice guy, too.