What do you all think about Makita? Favorite all-around blade diameter?

If your work includes cutting concrete, chances are you own or have rented a handheld concrete saw. These gasoline powered units are very handy, easy to use, and come in a variety of sizes. The most common sizes I've seen are the 12" and the 14", and a large number of them are Makitas.

What do you all think about Makita and what is your favorite all-around blade diameter?