I'm glad you're happy with your new purchase. Congrats! I, too, just ordered a pair of Denons.. the AH-D5000.
You compared the C700 with the Shure 310 and said they sound similar. The C700 has an 11mm dynamic driver, and if I'm not mistaken the 310 (if anything like the e3c) has an armature driver. If they really do sound similar as you say, I'd be interested in hearing either one. For an armature to sound like a dynamic microdriver, or for a dynamic microdriver to be as accurate as an armature, it sounds like some kind of breakthrough has been made on the part of Denon's dynamic microdriver in the C700.
Denon has always made equipment that was high-end or top-of-the-line as far as brand names go. There are other smaller audio companies that make extremely high end and top-of the-top-of-the-line products, but that is usually in the realm of amplifiers, cables, and components.... not headphones.
Since your IEM is a dynamic microdriver, let us know how it sounds after 100 hours of burn-in. Congrats again on your new purchase.
I think the Denon formula is working. The C350 and C700 In-Ear Phones should sell quite well. They will probably be available in most electronic stores for purchase. Having product on your floor shelf while the customer is looking for new headphones is the best way fpr the salesperson to sell them. I also think the high-end Denon line will excel in sales just as much, the AH-D1000 (to compete with Bose), but more importantly the AH-D2000 and the AH-D5000.
Regards,
PJ