UHMWPE is much harder to work from what I hear. I'm told it's rather slippery so can't be easily secured using things like clamps, so some people drill holes and pin it that way. I can't confirm this but Robert Cowan, a builder in the US, has stated it provides some benefits with this slippery nature as other weapons and wedges struggle to get a grip. But again, I've not used it so I can't say for sure!