I have it too and like it.
Flyin' Miata is having a group buy for the 2006+ muffler if anybody is interested...
I already have it, it's stainless steel and sounds just about right in my opinion, a good buy for sure.
http://flyinmiata.com/groupbuy/index.php
Cory
2006 Mazda MX-5 GT (SOLD)
1999 Mazda Miata (FOR SALE)
2004 Chevrolet Z06/Z16
2013 Kawasaki Ninja 650