I don't think the ACE stock is any lighter than the A2, but it doesn't act as a "buffer spring amplifier" and the foam tube is a lot more comfortable on cold days (like winter in Utah). There are sling attachment points on 3 sides and you can lengthen it by buying replacement butt pads.
You lose the A2 trapdoor compartment, but 2 AAs will fit inside an Ergo grip, so that's not a concern for me.
This stock and the Magpul CTR are very popular for good reason. With the Tubbs spring, you completely eliminate that "sproinng!" when the action cycles.
I'd buy one again.