The only one i have used that i would call excellent is a Dynabrade right angle. As said, it is right angled but not 90°, it's more like 97° if I remember correctly. It is just enough for your knuckles to clear the path of the wheel. It is direct drive so you do not have gears to wear out and the exaust come out by the spindle blowing sparks away and cooling stuff. If I was going to drop a pretty penny on a air cutoff tool, it would be the dynabrade. On the other hand, for straight models I have used cheap ones without problem. If you insist on buying a snap on tool, I would go for one of their kickass 1hp die grinders and throw a arbor for cutoff wheels on it. This way you would also have a high powered die grinder for running brushes and other demanding things. Plus, I usually take the guard off of mine eventually anyway, so I would not sweat the lack of guard. The other option would be the reversible blue point, which I feel brings something more to the table than the regular snap on. I'm not sur what you work on but in a crowded shop it is nice not to throw sparks at people/cars/your face. I would also look into the flexible mac tool. If you take the regular snap on, I am sure you will get good service out of it plus truck conveniance, it is just that it would not be my first choice personally.