Too hard to say. I've never used anavar or masteron. So saying for certain what type of gains you could expect by stacking them is difficult. Anyway I've done primo/wintrol and it was a positive experience, and going by what I know about primo and anavar I would expect nice gains in lbm and hardness with no water, and probably some fat lose if your diet is very clean. Its pricy and you won't get the dramatic weight gain you would get from test, but at least everything you gain will be quality mass. Just wish I knew more about masteron, or knew someone with alot of experience with it to draw info from.