I use the benchrest, low and high for different purposes. The Benchrest that you are contemplating is the only way to go for a bench, (cough,cough, truckhood, cough, cough) and is useful for target shooting from prepared or carefully chosen positions. I still use one for the bit of F-Class shooting I do. Make sure you get the one that swivels and has the notched legs. Without those two features you will either hate it immediately or will as soon as you try a good one.
The Low is good in rolling grasslands, as long as you can pick your spot for grass height. I found that for mule-deer I would start spending a fair portion of my attention picking spots to potentially shoot from. Again, if it doesn't swivel and have leg notches don't buy it.
The high 25C model is tall enough for me to shoot from sitting, and very importantly tall enough to shoot over stubble. The lowest setting seems like it would be too high until you lay down in the stubble with your low one. Then it starts to make sense. If there's snow on the ground the extra height lets the legs punch down through the snow and still have enough height to shoot. If you don't get the swivel you'll be hating life.
I originally thought pod-locks were a gimmick until I got a used bipod equipped with one in a trade. After that I had to go out and buy T-Nuts handles and convert all mine over.
