I bought the 2 gun kit from them 4 years ago(I think concours), it comes with 3 different size tips, for primer,color and clearcoat, haven't used them much.I still use my old sharpe cup gun for the primer but I sprayed my dash just yesterday in acrylic enamel. A lot less overspray but I cannot attest to the 4cfm claim.
but you can't beat the price.
It's a little different than using a cup gun (which is all I have used for 25 years) but at least using AE the finish is superior.
I plan to do the body in BCC in the next couple of months.