I have not used a Neopod before but I understand they are ok and very light.
Harris for me is still the best (for what I have used) for absolute solid shooting but there are drawbacks. They are heavier than most, they dig in your back when carrying the rifle with a sling. They also get in the way when shooting from sticks or some other form of rest that does not require the actual bipod. When you want to use one though, they are very quick and easy to use and for more continuous shooting (at the range or varminting when more shots are taken) they would be my choice.
For out and out deer stalking though, the Javelin is my preferred option. You know what its like, you walk for miles and might not even take a shot in one outing, five outings or even ten outings. Or, you might be presented with 2 shots the next time you are out. How often will you want to take a shot from the bipod? If I know I might be ambusing the known movement of deer from a specific spot, the bipod can be useful. Otherwise, it is something you sometimes want but not all the time. Definitely not enough to get having it dug in your back when walking miles up and down dale. The javelin can be quickly clipped on and provides plenty of support and adjustability for when you need it. It costs though but is strong and I cannot see how it will break. I shot about 30 shots from mine the other day working up a new load. I didn't even bother taking the harris off the .222 for that excursion such is my confidence in it but when I am out with a rifle knowing I will be static and taking a few shots, the harris goes on. When I am likely to be covering yardage with the rifle on my back and potentially not taking a shot, javelin all day.
