I am not familiar with these tires personally, but if you do 100% street riding especially a lot of highway miles, this may be a great deal for you.
Pirelli bought Metzeler a few years ago and I took advantage of the free Racetec offer they ran last fall (and is still going on) and it was great.
Check out the link below for details.
http://www.getpirelli.com/home.html
I am thinking of getting a set myself actually...