The Morgan works fine for premounted stuff, but it's a bit heavy for low gun games for most folks.
The weight makes the shotgun a bit muzzle light in most cases.
However, YMMV. The advantage of getting the fit closer to optimum may make up for the change in balance. Of course one can add a bit of weight to the front also to keep the balance as desired.
The KickEez will help with felt recoil better, due to size. The Morgan pad itself is not generously proportioned.
HTH......