Great question and one that we pondered on a bit even before we picked up our TT. Initially, we actually purchased the Furrion model with the 4" screen. As I was checking out this system, I was not digging the screen size especially as I age and have to depend on the screen on the road. I then heard of a product called Haloview BT-7. I read up on this system, did some research, put out some feelers and reviewed quite of bit of review videos. Plus, the cost was half of the Furrion set up. One thing that almost discouraged me from buying the BT-7 system was how I was going to install it on my 23LDE since it was pre-wired for the Furrion system. After watching some installation videos, this fear was quickly dismissed. I returned the Furrion system and purchased the BT-7 (which included side marker cameras) and came with a 7" monitor that sits on my dash with a factory mount included. Installation took me about 2 hours though it could have been completed in about an hour, but I like to take my time to avoid issues. Check it out and compare for yourself.