I currently have the D3 in one of my cars and will be installing the F90 into a different car in the next few weeks. I have however installed a f700 into a friends car and have to say that there is a lag during start up but the F series does seem to have a number if features that I have to say are good improvements. I like the fact that BT is now built in instead of another module that needs to be installed. I also like the fact that I can play video from my 1st gen iPhone on the F series and the voice commands are also a nice touch. The F series does not support navTraffic if this is somethin