@orkan used Harris bipods for a looooooong time from here http://www.e-arms.com/harris-bipod-13-5-27-rotating/. They work very well. I would suggest getting the "S" models that pan side to side. Esp for field or match use when you do not have time to adj one leg at a time to level the rifle from e-arms.com. I also preferred the "leg notch" models. I found it much quicker to just push the button and pull the leg out one notch at a time on very uneven surface vs loosening the clamp tension screw and trying to pull the leg out. I still use the 25C model for some sitting positions while hunting, altho at 27" extended it is still a lot short for a sitting position from a seat or bucket and you will need a short stool. It is not comfortable to sit with your knees above your hips for a long time.
A few years ago I switched over to Atlas V8 models. Just the leg angle positioning was worth it to me. The side to side pan and left to right was very nice also. The leg height adjustment is far easier than the Harris. One hand only, up or down. It seems the Harris has to be a two handed adjustment sometimes. The ADM lever is far easier to use and does not loosen like the Harris stud mount can sometimes do. The ONLY thing I really did not like about the V8 models was the short collapsed length of the legs (4.75") I always had to adj the legs out to aprox the 6" position to shoot comfortably and not feel like the rifle was too low. It is difficult to preload the bipod or get much of a bit on a flat surface since the legs and feet rotate. I had the claw feet on one and they always seemed to be canted to much and would not sit flat on the ground with out messing with them.
This year I upgraded to the PRS long leg models and am looking forward to using them The long legs will work great for me since they start at 7" and I will not give up any height adj. They also extent to 13". The legs do not rotate like the V8 model and that is a big plus.