I still have to use this in the car, but here it is outside in the sun:
I did stick it in the car to see if the sun reflections would blind me and it is a fair bit better than my non transflective Xenarc, but I think it will still wash out.
It looks like the Inelmatic has a glare finish like the laptop in the above photo. It should make it easier to read in the sun providing objects in front of it (ie, you, passenger) aren't directly illuminated by the sun and reflecting back in the screen.
A direct reflection of the sun might be a bit less painful on the anti-glare transflective monitors, but readability might be a bit lower.
With the current technology I don't think there will be a "best of both worlds" monitor. Nothing will be readable when reflecting the sun into your eyes and touch-screens just make it even worse.
In the end it comes down to what you prefer to look at, I don't think there is a clear winner.
Best performance will probably be achieved with a non touch-screen display. Or don't but a car with a sunroof