I forked out $90 for one of those "scookem, groovy cool bi-pods" Harris type, but mine seems to be more of a hinderence then a help. I ussually set up against something and if I have the bi-pod extended I have to lift it pretty high to get it over my knees. If I set up in the edge of brush to conceal myself the bi-pod gets caught up if I try to move it. Its great if I'm hunting open areas, and can generally count on one lane of fire. Other rhen that it quite the burden and stays home more then not.
AY