I've had one for a few months now, and haven't ridden with it yet in the rain, so can't give you a full review.
If you look at the bike side on, the Standard Screen is much more upright. The Touring Screen, although taller, is actually quite swept back, and is probably more aerodynamic. It offfers much more body protection, to my not inconsiderable bulk, but delivers it straight to your helmet. I no longer get any flies on my shoulders, but seem to get more on my visor. I'm a little over 5' 9" so it won't be the same for everyone. I also have the comfort seat, which puts me a little higher. I'm hoping that when I do get to ride it in the wet this concentrated flow of wind will keep my visor clean rather than having to keep wiping it.
Overall, I'd say it's a nice bit of kit, much better protection, and cleaner airflow, and no turbulance for someone of my height.
If you're passing by Leighton Buzzard, you're welcome to try it.