To get the most benefit from the Y grip or Z grip, use a bottle adapter that is mounted under the grip. This makes a good shoulder stock with the bottle and also allows your wrist to fit comfortably in front of the fat part of the bottle.
I don't have a Y grip, but I shoot a 90 degree frame on my retro mag and my Angel. I love it, but a lot of guys that are used to 45 grips have a hard time to shoot it. Even they unanimously agree that it is comfortable on the wrist.
Except for the Automag in front, its usually the man behind the equipment that counts.