Pumas are also pretty sweet with HEAT rounds from Elite Armor - that being said I think Pumas are more of a unit you get with with a specific build/strategy in mind. (Or when your facing something non-meta like multiple AEC/T70/Stuart) Otherwise they tend to be a bad investment compared to Luches (especially with the current Volk Shreks to cover you for AT as mentioned).
I know RedWings is pretty fond of the Puma - you can probably dig up some of his replays where he uses it to good effect. (He'll often use it for AT in heavy StrumPio/Jeager builds from what I remember)
