Got this info from Michael, thanks a lot for sharing with us..
"Today I decided to buy the African Lion as I thought it looked cool and notice it gave me an indication of my strength increasing due to my purchasing. It also work on defense as well. So pretty cool feature Zynga have added!"
Check on this screenshot below..
Althought I don't want t recommend you to buy Limited Edition Item, this feature is nice! At least we know our strenght right away after we bought the item.
Thanks for this nice feature, team!