I found the Michelin products to be twitchy, nervous when pushed near the limits during hard cornering. They would not slide until the limit was reached and then they would just let go without warning. They roll like billiard balls and have tons of grip but will bite you if pushed past their limits.
The Vittoria products seem to be a little more forgiving and predictable. They will start to slide gently, letting you know that you are near the limit, and if you let off then they will gently start to grip again. Very supple and easier to push hard.
The Corsa G+ is 252 grams. The Rubino G+ Speed is 198 grams and I believe it is superior to the Corsa G+ in terms of grip in corners, how it accelerates due to light weight and rolling resistance especially at pressures >100 PSI. The Corsa G+ pick up every pebble, leaf and grain of sand or glass and will be coming off my bike as soon as they wear out in favor of the Rubino G+ Speed.
Rubino G+ Speed wear out fast though, and are probably not a good choice for areas with nasty roads and lots of debris.
The Corsa G+ Speed is interesting but at $80 each I'm in no rush to find out.
I'm thinking of a townie bike and those Compass jobbers look really nice.
-Tim-