Not at all, i've owned both.
Essentially the T1R pro argument hangs on this: They allow you to slide the vehicle at a lower speed due to the tyres outright lack of grip.
I've never seen this put forward as a reason to buy a tyre before, interesting stuff.
Can I just say that this is not an argument I put forward. I've found the grip very good, Simon's description of the handling is a much better criticism - their soft sidewalls can feel nervous at times. I don't really agree with Crinkle that they are designed to be slidey - I haven't really felt that and that's certainly not something I would want from my tyre.