My Garmin Nuvi 1300LM ($133 on Amazon/$150 with traffic) fits well horizontally in the holder and doesn't have a problem picking up the satellites. I don't attach the power cable because I don't use it for long trips (I have factory nav in other vehicles I use for that purpose). Prior to this Nuvi I had another Nuvi that had traffic info, but the power/antenna cable was so unwieldy because of its length and thickness that I seldom used it.Does anyone use a portable GPS on their Electronic Device Holder? Is it working out well with signal (GPS and Traffic) and...staying put? What GPS device do you have?