Additional: (don't worry, this should be short!).
I spent about 40 minutes this afternoon retrying 16 and 32 Ohms headphones because I had forgotten last night that the "gain" on the LittleDot was set to maximum (intended for high-impedence headphones). I do not know if when set too high it is not operating as well, but when set to the lowest gain (there are 3 levels), it is doing a better job than direct (dyn and bass). Enough to be worth carrying that device on top of the iPod? I'm not sure. I just wanted to correct the misinformation I unadvertantly gave in last night's report. Note: I have not retried 16 Ohm with receiver (and will not spend the time either).
And my LitteDot Mk V is STILL at custom in Vancouver (in its third day now).
