I agree. If I have one or two small parts which need to be sprayed and don't want to crank up the gun, even if it's my touch up gun, the compressor, and the hoses, I use one of these. It's also cheap enough that if I don't feel like cleaning it, then I really don't have to, unlike my guns.
The fact that you did an entire car with one speaks less about the system, in my opinion, than your determination and skill. It looks good.