Be very very careful doing business with a co. in New England. Nothing good comes from there. I know. I lived there for a while. 
Well, I wouldn't say
nothing good comes from New England - I had really good luck using Pratt & Whitney engines over a couple decades, and they come from Connecticut. But I was certainly glad to leave New England, myself, 35 years ago, never to go back.
All kidding aside, RealTraps, GIK, Acoustimac, etc. all are fine by me as I think I have some products from each of them. I do not know anybody with room treatments that will ever go back to untreated rooms. In fact, that is usually the first thing I notice now in public spaces like restaurants or libraries - how excessively noisy and reverberant so many are.
But to get back to the OP's question - I do not have any specifics on Realtraps vs the other brands. There was a brand (also from Connecticut IIRC) that was Stereophile recommended a few years ago, now defunct, and their products were sadly deficient. Little bitty panels of fabric-covered foam or 1/2" fiberboard. But, as I say, they are now defunct and not to be confused with the firms mentioned here.