I have gone from the N series to the D series the Z Series and now the F's.
It is an intresting unit, does take a long time to boot up, the bluetooth is way better and links up with my phone much easier downloaded my addressbook with no worries and is pretty cool in itself. The touch screen is hard to use and the buttons are small and have to press them a couple times to make them work, the mapping is very easy to see the roads on but in 3D mode jumps around alot. I miss my 7 in display now its 5.6 but looks nice installed in my 05 mustang. Had to turn off the warnings though unit constant