I had a fieldpod for a couple of days and then returned it. I only tried it out in my reloading room, not in the actual field. It looks good, but from that point forward I didn't care for it. As many companies do, they buy all the rights to a great product and then build it as cheaply as they can to make more money.
The fieldpod does work, but cheaply made relates to problems later on.
I do have a Pig Saddle on a tripod which is similar to the death grip. I have also used a hunting partners Deathgrip in the field and find it to be very stable. The Deathgrip tripod is much sturdier than the fieldpod.
Even though I still have the Pig Saddle and it goes with me on every hunt and target practice session, I use an arca rail every time. The Pig Saddle is a backup in case I have a problem.
There are some videos out there that show some hunters converting their Deathgrip to an arca rail.
There are other setups on the market very similar to the FieldPod. The drawback is heavier to carry a longer distances.
I had one just like the one pictured below. It was very stable and easy to set up. Heavy to carry.