I curently have the Cresendo. Pretty good for what it is. No complaints with it so far..

One day, I'll get the Iwata HP series!!

Air source is important, as mentioned; steady even pressure, and no water! a solid regulator is a must!

I've had a 150 for a long time. Never any trouble with it, as long as its maintained. Seems this is the crux, proper maintenace & cleaning.