Just my 2 cents worth. The country I hunt in is hilly and I'm usually sitting on a side hill or knoll for some elevation.
I have both the Harris and Stoney Point bipods which will adjust for my sitting height. They always were a proverbial pain in the rump because once adjusted for elevation swinging them from side to side meant lifting everything up and swinging the legs from side to side. Tooooo much movement when your hand calling and a yote is coming in and looking your way.
I always hoped Harris would make up an adaptor to allow the bipod to swivel, let's say 30 degrees from side to side. I opened one of the links and see that Harris do make an adaptor but looks like you have to have a picatinny rail to attach it.
Frustrated I bought a Vanguard and found that after using a Harris it was worse than useless. More fuss trying to adjust the legs and the pivoting mechanism is just cheap plastic and not all that stable. In fact the post where you would attach the front of your rifle sling is plastic as well and I just wouldn't trust carrying a rifle with an expensive scope attached. I've never seen a piece of plastic yet that never finally broke?
Personally I wouldn't advise anyone to buy the Vanguard. At the moment I use either my mono-pod or my shooting sticks and to be honest it's the mono-pod 95% of the time.
