Lancerboy.......business is business. you ask 10 painter abt their job, 10 painter will tell u that they will do a very good job. Funny but true.
There are many ways to see if the paint job done is good or bad. Just look at the corners of panels, see the eveness thickness of the paint work, overspray (like paint near window rubber, tyre, light, wires, bumper, chrome parts, exhaust pipe....other area that should not be painted) There are a lot more I can tell u. There prep work before paint work is 80% to produce a good paint work on the car.
By the way, I wouldn't recommend u to use the car for at least a week after being spray painted as the paint isn't 100% cured (yes, some claimed that oven baking can overcome this problem, but I wanna play safe here than sorry). I know this could be a problem as many ppl depends on their car to cari makan.
BTW, what color change to what color of your car?
Anyway, where are you from? If needed advice, just call me. Give me a ring (phone number will be given thru pm, if reqired). Happy painting the car!