I like the Harris 9"-13" swivel leg notched with pod loc. I'm 6'0 225lbs, my chest and gut keeps my head off the ground a little bit 
. The smaller 6"-9" bipods are too short for me to get the gun level to the ground. If your a smaller framed person, it may be more comfortable. Also choose a bipod that is in the middle of your range of adjustments. For me that is about a 11" bipod, so 9"-13" is perfect for most field conditions. Remember, in the field, you'll have to shoot uphill and downhill, so make sure you can do both with your bipod. When higher is needed, I use my Stony Point shooting sticks.
