I have all three, Versa, Harris, Altas
The Versa-pod is easy to load as there is play in the legs; however, as Speak has stated they are sloppy and the rifle may tip over when you have it resting. It has its advantages if you are hunting as there is no friction or restriction from panning or canting, just you have to reset your position accordingly. Also they detach and attach very quick and easy.
The Atlas is a fine instrument, and loads excellently. It moves back to its original configuration and is stable. I like that it has a low profile when folded and the options to deploy out to 45 degrees for a lower stance.
In the end the Harris is a workhorse. Quick deployment, on and off without an issue (just a thumbwheeel). Stable in rest position, easy to cant(best with podlock). In the field I use a Harris and bogpod. For fixed targets prone off the harris, moving on the bog pod (tripod).