I had a spartan, ended up shooting off my pack on that hunt. The other two hunts I shot off a tripod. I ended up selling it. Full circle now, I just won a custom rifle package that comes with a Javelin Pro Hunt. Not positive I'll keep it. Those MDT GRND POD bipods look very Intriguing with that price point. I also just ordered an Anvil ARC so I want to get some reps with that and see if I can basically use my tripod as a bipod. The Atlas looks like a pretty good setup. Ive never used one.
I can't compare to anything else, but I can tell you why I chose the Javelin. My priority was not the most stable bipod or the best for long range shooting. I wanted it to be adequate for long range but it didn't need to be the best. I put my priority into weight and handiness. Most of my hunting is done inside 300 yards where I don't need a bipod anyway. For those situations, I just leave the bipod off. The thing only weighs 8.5 ounces so it goes in a belt holster without any effort. If needed, it takes seconds to deploy it and it only takes one hand to do it.
If stability is the priority, this probably is not the answer. It isn't bad but certainly not the best. The advantage to the Javelin is how stupid fast and handy it is.
We sell both, they are for 2 totally different purposes. One is built more for the range in mind, where weight does not matter and actually can be a huge benefit, the other is for hunting where weight is the main concern. Both will get you steady enough to make a great shot.