so far im loving this 34xx fw than 37xx, nice overall layouts and functions, best improvement imo is the calculating/recalculating speed, which is exactly what i need.

other improvements,

-map drawing speed on normal is much faster, car movement is also smoother.
-initial sattelite aquisition i feel its faster and stronger than 37xx and i think they use the same antenna.
-overall quickness of touchscreen transition time/responsiveness is much smoother.
-more street names appear under "more map detail" (i dont remember seeing that many street names on 3750 b4)
-able to change speed limit on simulator mode.

above r the noticeable improvements for me, other features such as advanced detour, trip planner etc i dont use them so i cant give out my opinion.
the rest r just eye candy, such as different poi icons, layouts etc.
1 thing i noticed abnormally, is while using simulation, car and the map "jumps" (dont know the correct term), but i believe its fixable through future fw update.

a quick question though, can a 3750 hardware support voice commands at all? because i cant get that to work on a 34xx fw..

lastly, im very happy and satisfied with this mod, i wont go back to 3750 anymore