I did just the rears and that was a big improvement for me.
i was just thinking the same thing. i don't really have an issue with the fronts at all. although i think better quality/ sounding speakers all the way throughout the car would be amazing. I may upgrade those as time goes on but as of right now i need fuctionality and having a DVD Player that has Bluetooth with hands free, reverse cam, nav and i can use over 90% of my apps on my phone directly from the DVD Player itself i think will make things alot easier for me. Plus I can watch movies on my lunch breaks lol