I just purchased an SRC M4 with the Crane stock, I also have an SRC M4 with the regular Extendable stock, I enjoy the Crane stock much more it is more comfortable even my wife who is just not putting a toe into the Airsoft water perfers the Crane stock to the Other, it just feels better against the cheek, The Battery placement is a bit intresting though because it takes a bit more dexterity to get it placed correctly the first few times but once you get the hang of it, its a great weapon. I purchased the kit from JT I got the weapon an extra Mag, Battery, charger, Mask, and 3 point Tactical sling for about 240.00. Its great for a starter.
Just My .02 cents worth
Falcon