I like the HK drive and play as it controls the iPod as well via dash mounted screen, or where ever you want to install it, and control wheel, by the and brake in my case.
It charges this particular iPod.3rd gen. but is too old to work with my iPhone4. But that's fine as I don't want to have to plug the phone into anything other than a charger when get in and out if the car, or have a cable hanging out the dash, and I have the older iPod that can stay in the car anyway.
Sound, all tracks when played have a slight hiss/squeak/warble/radio static type noise that settles down go a lower pitch and is then drowned out by the music almost completely. TB reckoned this is almost exactly the same as his Dnd one. There is no improvement go be had over this as it's hard wired to the fm plug on the back of the radio connector on the cage. .....although I wonder if it could be soldered into the cd function of the nav slot as TB suggested....? One for another day perhaps.
In all honesty I find the sound perfectly acceptable and now rarely listen to anything else. Easy to use, and find I rarely need to re tune, although that a very simple process anyway as there is no limit on frequencys via custom setting.
Only thing is, they do seem prone to damage from spikes in power input or something. Even with a fuse. TB wil know way more about that than me of course.