I guess whether you like it or not will depend on your stand on Ephedra. That would be the biggest part of it that will either influence you or not. I read up on it on the website and it has 25 mg of Ephedra. Most of the products that I have seen have considerably less. The one I have been using only has 12 mg.
I myself have been on a supplement containing Ephedra for just over 10 months now and I haven't had any problems. I have a friend who has used it for 4 1/2 years now. We both have lost weight and she has kept hers off although she does take 1 caplet daily. I never take more than 2 myself.
If you're going to try Stacker 2, I did read on the site today that they are giving away free bottles.