I would strongly urge you to NOT install that unit. I had it and couldn't wait to get rid of it.
The wireing for this unit is different to any other head units out there, so you would have to do a custom install.
Also, the sound quality from this unit is very poor. Not much Bass or Treble control and is designed for only 4 speakers with no sub out.
Ask the person you are getting the TomTom from why they are replacing it.