GPS sleeves and mounts

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Has anyone any knowledge of these ThinkNAVI PDA GPS Speaker Cradles ( http://www.handtec.com/acatalog/ThinkNAVI_GPS_PDA_Cradles_with_Intergrated_Speaker.html#a1_21142 ) and how it compairs to the navman sleeve for the ipaq?
I want a simple GPS device for the car so I can transfer it fast, without cables, and with out the need to keep recharging bluetooth devices. I also want to run TomTom, which I beleive you can on both.
Cheers