Have all three, love them! Actually on most of my setups shoot these better than using a rabbit ear rear bag and prefer a bipod/bag versus an adjustable front rest and rabbit ear bag.
Maybe it's just me, but there are some setups/situations where I'd really love to have a version one size shorter than even the compromise. Especially with some of the chassis there basically have a built in bag rider. Mostly at ranges with tall bench height, but short seats height where you either bring a pad to raise the seat, or you end up having to shoot with a pretty low bipod setting to get the gun in your shoulder. (I know we should all be shooting prone, but some ranges simply don't allow it)
