I agree w/ Tim's assessment of the 401- the battery life is very good (using lithium as well), the receiver is very sensitive- I was getting signals in some pretty tight confines in a recent trip in NM
the strap is a little hooky- I like Mike's idea of replacing it w/ something simpler (and lighter :) )
the altimeter seems to work pretty well (would get the elevation before the UTM's would come up, once the UTM's came up I'd compare notes between the two)
I'm going to have to a little homework though on uploading/downloading data w/ it

