Been varmint hunting for more years that I want to admit

and I've tried just about ever kind of shooting support system except portable benches so I'll share my experiences with you:
The newer Harris style bipod with the "cant" capability when shot in the
prone position are the most accurate in my experience but less so in the sitting position. I've found that attempting to adjust the height to be cumbersome when stalking and quick shots are needed.
Using bipods was not the best system in the terrain where I hunt since I often had to pass up shots because I couldn't see the critter, i.e not enough height - restricted view of view.
So about 12 years ago, searching for a better system, I began experimenting with shooting sticks. I tried several commerical versions and found all of them lacking for my needs: didn't anchor adequately in the ground, not stiff enough, too cumbersome to adjust quickly, too unstable - too much flex, insufficent height. In addition, the sticks alone didn't solve the problem of the restricted field of view.
Continuing to search for a better system I purchase a portable, lightweight sportsmen's chair then build my own shooting sticks. The sticks consist of 1/2" diameter solid aluminum rod cut to 43" in length, shaped to a point at one end. On the other end I placed 12" of 1/2" ID heater hose and bound the sticks together with 1" black industrial grade velcro about 5 inches from the top of the heater hose. Total cost under $20.00.
What I ended up with was a shooting system that is very stable, adjusts for height easily within seconds simply by changing the spread of sticks, lightweight and easily carried and above all capable of very high accurate shooting when used in conjuction with a lightweight folding sportman's chair so you can sit on the chair and support your elbows on your knees with one hand on the sticks and the other on the rifle (four points of contact - elbows on knees - feet flat on ground - gun and sticks locked to together into shoulder with non trigger finger hand.)
The other advantage to this system is that by sitting higher, you have a much greater field of view making shoots possible that are not with a bipod either in the prone or sitting position. Also, you don't have sit on the ground and risk the ticks getting on you which is a real problem in my area.
I've shot 1,259 ground hogs with this system and can attest to it's capabilities out to 300 yards. However for shots beyond 300 yards for varmints, it's less desirable since it's not as stable as a bipod in the prone for precise shooting. Incidently, approximately 40%of those kills would not have been possible with a bipod because of terrian issues.
If you like to stalk and move around a lot and the majority of your shots are 300 yards or under at varmint size targets, then this system will work very well. However if you like to set up where you have an advantageous field view and have shots over 300 yards I'd opt for the Harris Bipod with the cant device and shoot in the prone. Field of view is not normally an issue at longer ranges.