The RTI touchpad has a lot of pros and cons.
Personally, I like it, but not every aspect of it. For me, I think it has more to do with the menu structure than the use of the touchpad itself. Some people like to use it with lowest force feedback, I like it in the highest feedback position. The main issue remains the input of town and street destinations for GPS functionality. To scroll over the screen's keyboard I use two fingers without leaving the touchpad and pushing the pad down as 'enter' function instead of tapping it twice. For me this is the easiest way to do it, but it remains rather dangerous to do this while driving.
The other issue is the number of functions that are hidden in the central menu without direct button access. This is mainly the case with LS and LC. It is simply too complex to get to the extended seat controls and climate controls (even if the Climate Concierge is doing a great job).
So mostly it is not very intuitive, but as a user you get used to it over time.
Ideally, the combination of touch screen and touch pad would be a nice one. But then again, there is a strong need of rethinking of the menu structure to make it more intuitive.
After all these years working for the Lexus brand, I am still surprised of the fact that Toyota and Lexus are rather slow on reaction to customers' requirements. I suppose this is one of the downsides of the Toyota Kaizen philosophy, which slows down the actual go-to-market procedure apparently? Or perhaps it has to do with the financial investment to use a certain number of parts over the years in different models?