I have 2 Tutto bags and really like them. My only complaint is that there isn't any padding for the machine. I usually pad mine with the fabric I'm taking to the class and sometimes a quilt. They are a bit pricey but you can find them on sale if you watch for them. Massdrop had a deal on some when I got my small one for my FW.
The really awesome thing about the Tutto is the way the wheels turn as you go around corners. It rolls better than any bag I've ever had.