When I added my Landing Gear, it gave me the extra track for mounting a few rod holders and I chose the RAM 2008, a pair of them.
What I like most? These certainly aren't for trolling, that is for sure, but they sit right behind me and I reach back and pull them out sort of like an archer pulls an arrow out of a quiver. When I want to put the rod back and change to another, I reverse the technique and it is just so easy to slip them in.
I like the ball track mounts, too, so these can be mounted in any direction all the way from vertical to lying flat.
Again, these are great for just holding rods. I'd use something else for trolling and other circumstances.
PS. Gonna take a look at the others mentioned here, too.