They work well as a combination for me. I haven't found anything that is an all-in-one unit thus far.
If the holder is plugged into the cigarette adapter, then you have to have another adapter available. I use a holder that has another built into it, I will post an image later..
That is not a charger - it's just a holder that uses the cigarette lighter.
Pretty useless device!!! holders are a dime a dozen! That is not even relevant to this conversation/thread!
I would like a cradle/charger like the skydock but without the XM capabilities. If it was cheaper, I would have probably bought it just as a cradle/charger.