I didn't install TW navigation system in my Corolla but I had a look at it in my friend's car. He didn't opt for navigation option but got reverse camera. Overall, it is a good system.
An important point to note is: TW is asking for 35~40k for this system however some dealers (Loud Electronics Liberty) offer 25~30k depending on navigation option. I wonder why dealers are selling cheaper than the company rates.