I haven't had the pleasure of hearing the Arro's, but I do own the VR-2's. I upgraded to them from the Quad 22L, which I suspect have similar qualities to the Arros, but with a bit more bass.
I find the VR-2's to be a bit more "grown up" for lack of a better term. They seem bigger in sound (of course they are bigger) but their bass and midrange is very appealing to my ear. After listening to the VR-2's for a bit, I went back and listened to the Quad's and I found them to be thin and harsher sounding. Overall, I'm impressed with the VR-2's. They can be tricky to set up, but using a free pink noise file you can find online and burned to a CD, you just play it and move the speakers around until the noise literally hovers a few feet in front of the VR-2's and in the center. Took me about 20 minutes playing around with it to get it just right.
Re the rear tweeter, I use it at about 50%. I'm a tube guy, who also prefers a clean high sound, but without the harshness.
Brian