A few years ago I tried a Harris Bipod during a Wyoming antelope hunt.
The model I used did NOT have a swivel on the front that allowed for leveling
the rifle if the terrain was not precisely flat. The results of this model
were extremely disappointing. In fact, I missed an animal, something I almost
never do (this was not entirely the fault of the bipod, but the damn thing
was distracting).
I returned this model and bought another model of Harris Bipod with a swivel
that allows the rifle to be leveled when the ground is not flat. This little
swivel feature, that is nothing more than a cheap pin that allows the rifle
to be moved right and left, costs another $50.00 (rip off!). The total cost
of the model with the swivel is something like $129.00. However, the addition
of this cheap pin completely changed the character of the bipod. It works
great in the field and provides a near bench rest type platform to shoot
off of, either from a prone position or sitting. I shot one antelope with
the Harris Bipod, and so did my hunting buddy. We both liked it. Antelope
or varmint hunting are the only two situations it would likely be beneficial.
I recommend the swivel model for these hunting applications.
You do have to be careful of the contraption. They have spring loaded legs
that can unexpectedly pop out and give you a nasty hit in the face. This
situation nearly happened to me and did happen to my hunting buddy. If it
had hit me in the face, it probably would have broken my glasses - maybe
caused a serious wound. Be careful!