Alpha Male is a blend of Tribulus and Longjack......along with a third ingredient which I dont recall.
the product you bought from Metrx is plain Tribulus.
yes , I can tell a difference when not using Trib or Longjack .
personally I prefer Longjack over Trib .
I've never used a product which contains both Jack and Trib . but I have used both at the same time .