I've had my Aria for a while and use the crossfeed alot, but can, whenever I want, flip the switch and it's defeated. At a few of the meets I have been to, I've heard all kinds of sounds and listened to all kinds of claims. Bottom line for me was to trust my ears and only go with what sounded best for me. I kept the Aria because it gave me the option to change back and forth. Forget the fanboy stuff and get as many samples as you can and then make your choice. Don't rush it. Why don't you change your headphones by trying to borrow someone's that you would like to hear, or a signature sound you would never think of buying or upgrade to, and then see how much of a difference there is? Whether or not you believe it, little things like power cords, inter-connects, line conditioners, etc, to some degree can even have an influence. Think of the differences in the music you listen to and then think how much that price is a factor in making a slight, (or drastic), change to that magic amp. When you think it been enough time, (it seems to go on forever), then you'll be ready and happier with your choice. It's the music that's important, and your enjoyment of it's sound. Best of luck in your search........