Personally I think the X10 is great sound-wise, it fits with the Klipsch house sound, but if they kept a similar sound and introduced a replaceable cable, I'd sell my old pair and jump on the RC version.
It is very interesting that since the X10 has been discontinued, Klipsch doesn't offer a flasgship IEM product. The X10i that Klipsch currently offers has a control and a microphone for use with Apple products. I doubt that folks looking for a mid-range IEM will purchase this product unless they use an iPod or iPhone as their music source. Klipsch either needs to bring back the X10 as the flagship product or develop a new/better product sans Apple remote and microphone. Thoughts?