I seem to be answering this question on both forums. I came from an 1500 Goldwing and to me the ST seems very quick and nimble. The FJR even more so. They both make me enjoy even riding in town after the 1500 which just yearns for the open highway. Most of my riding is in a straight line (I live in Iowa) and I'm not real agressive in the curves, so the ST fits me fine.
It is funny that on the ST list, you will get just the opposite response to Mighty Joe's question. You need to drive both and see which seems the most appealing to you.
Also keep in mind that when comparing apples to apples, you have to include the YES warranty in the price of the FJR as it comes with a 1 year and the ST comes with a 3 year.
I have also noticed that as we ride, I can stop much faster with my non-abs ST than my wife can with her ABS FJR. I don't know if is rider experience, but I think the ST has great brakes.
OTOH, I do love the FJR motor.
Tom