Has anybody tried both the GK Ultraphones and the Remote Audio HN-7506 isolation headphones? Both use the Sony 7506 drivers. I've had a pair of Ultraphones for many years and I was thinking about picking up another pair when I stumbled on the Remote Audios, which look a bit more robust (not that I've had problems) and professional. The HN-7506s have gel earpads, which I generally prefer over the kind on the Ultraphones, and appear to be made from a David Clark headset that has plentiful replacement parts. I know I won't go wrong with Ultraphones, but I'd love to hear from anyone who has actually tried both sets. Thanks!