We are here to help give info/options and let him make his own decisions. Sometime someone does not even know the right questions to ask at first. By his post he is very new to the game. Also, he does not understand rated vs actual real world panel outputs.
I guess by your response to me that we should have just answered yes or no to his question. So by your answer of " yes" meaning that he will get advertised wattage, you are misleading him without giving him full disclosure of advertised vs real world outputs on panels. Even though you listed different controllers, the likely hood of him getting listed wattage would be slim due to shading, wiring, sun angle, different times of year, battery charge levels, etc.
As far as "harm", nothing I said would harm him at all. Matter of fact even though a 10 amp controller will have a max of 140 watts at a given peak solar collection time, over paneling will collect more solar in the early and latter stages of collecting energy.
I tend to think that dialog with a poster getting more information and options is the key not just giving a quick yes or no answer,