"I have mono Zen Sleek; do'n't need to carry both cables"4.5 starson by jen_neva
Pros: 20gb, FM Tuner, Light, Design, UMS, Great Sound
Cons: Double proprietary cable
Summary: First if all, this is a great unit, very happy with it.
Just to clear things up on the cable, you DO NOT need to carry both parts. You can carry just the USB part for transferrig data and/or USB charging. The AC adaptor connected will charge it faster, but is NOT required. If I really need to, I can leave the AC adaptor part in the car connected to my DC inverter, which I got online for like $18.
The color screen addition is tempting, but for $100 dollars more, I don't know if it's really worth it. The mono screen is easily read even with the backlight off, and this unit, IMO, is mainly for listening to music.