I would rather feed my fish well, and that seems to take care of any needs my SPS has. Nothing wrong with feeding aminos, but if you know what amino acids are to corals, unless you are providing either a necessary AA that they do not normally get or cannot synthesize themselves, you aren't going to see anything except maybe increased growth.
IMO, the idea that you are going to get better coloration from feeding AAs to corals is a myth perpetuated by the marketers of these products. The only way you might see better coloration is the same as above, if the AA you feed is correcting a previously existing deficiency in the coral.
I dosed AcroPower daily for 4 months straight in my 465 gallon SPS tank and saw no change after I started, and no change after I stopped.
Personally, I would rather put the money I'd spend on AAs into high quality fish food and let the corals eat the high quality fish poop.