I got a JR XP662 as my second radio. I am very happy with it. So will you if you get it. Danny, at the JR Trasmitters and Radios forum does an excellent job here at RC. Visit that forum and ask him whatever question you might have. If I were you, I would stick to JR. Not only are they excellent quality Radios but you can use your Quattro as a trainer box.
Luis