Things I liked: Slipped onto my S510 rifle in just 15 seconds. Absolutely no fitting required. I decided I wanted a change of pace from my Ultimate Sporter, which is a super rifle, but weighs 8-plus pounds. Now I have two rifles, a light (6-plus pounds) hunter and a target/competition gun. All for just $200 more than the one rifle. The green stain is uniform overall and I really like it. It's actually as much brown as it is green.
Things I would have changed: Maybe talk Air Arms into fitting some sling swivels? Ah heck, I can do that for about $6.00!
What others should know: The grip is a bit smaller in diameter than the one on the Ultimate Sporter stock, but as with all my rifles (Crosman, AA, FWB, FX) I almost immediately found a comfortable grip for my right (trigger finger) hand. The forearm is comfortable as well. Oh, for you left-handed folks out there, this is a totally ambi stock. Changing to this stock moves the balance point forward a bit, maybe 1.5 inches, but that suits me just fine.