@T.R.A.N.C.E,
Can you please hold yourself from complaining until we have tried a real X5?
I look at spec sheet too, but I I do so only to avoid a bad product (once spec is audibly transparent, it is no longer relevant). You should make sure that spec's that you are complaining about are relevant and that you understand/interpret things correctly/accurately.
Re relevancy/accuracy #1, you complaint, twice in this thread, about scroll wheel "stick out hugely" from X5's computer rendering. Note computer rendering is not a real photo. Real photo of DX50 shows buttons sticking out too, but that does not prevent you from liking DX50?
#2, You mistakenly stated, at the other thread, that Fiio X3 has power supply of 5.5v. James Fiio kindly corrected you that it is 11v (+5.5v minus -5.5v equals 11v). Hopefully you have learned how to interpret spec's objectively/correctly.
#3, Re CPU speed. Sansa Clip+ has a CPU that is only about 50% as fast as that of Fiio X3, iPod Video has less than 25%, yet both perform very smoothly under Rockbox. So firmware implementation is just as important. I don't think DX50's firmware is as stable as X3's (yes, I have followed both threads to latest firmware). How do you know X3/X5's future firmware is not significantly more efficient than that of DX50?
Also remember DAPs do not need as much CPU as smartphones. Even in smartphones, CPUs are underclocked (e.g., iPhone 4S, 4 and 3GS). How do you know DX50's CPU is not underclocked?