Prostanozol makes you feel GOOD. It's almost a pure androgen, with weak anabolic properties, so it comes as no surprise that it can't add massive amounts of muscle but instead helps body composition significantly.

You want aggressiveness, energy, libido? Prostanozol will give it to you.
You want something to counter catabolism while dieting and doing lots of cardio? Prostanozol will do that for you.
You want something that will have a positive effect on body composition? Prostanozol does that, too.

But if you want to add muscle mass, look elsewhere, this is no mass-builder, more a quality improver. It will help keep a bulk lean and it will be useful on a cut also.

Overall I like Prostanozol a lot, but I find it a little expensive. It isn't methylated so you can stack it with anything, and that's a big pro.