I think any clay bar is awesome! Louis loved the Zaino clay bar on his car, I loved Mother's on mine. Any clay seems to really make a difference.
My car has lived outside for 5 years (pollen, bird crap, dirt, other airborn pollutants), spending some time with the clay bar made the paint feel smooth as a baby's behind. Zaino made it look better than it did when I bought it almost 4 years ago. Really shiney, nice deep color to it. I've always thought that teal cleaned up real nice like, Zaino just make it even nicer. Looked, IMHO, better than it ever did using the 3 step Meguiar's Gold Class stuff.