Im a noob; soooo this is something I can answer! I just bought my first airbrush; before that through my teen years(21 now) I built 15-20 models just for fun; none came out real great, but about 6 years ago a hobbytown USA opened up and I started using the tamiya cans rather than testors; and now I use the airbrush.
my thoughts...
first off; it was important that you shake it VERY well; Id shake for 10minutes the first time; maybe it was overkill; but with no way of knowing if it was too little; Id rather too much. before I shook though; Id sit the can in warm water; I used water that was about what Id bathe in. not burning hot; but hot. helped thin the paint and get a better mist.
with that said; the tamiya was light years better than testors; it went on smooth IMO; only a little worse than my first trials with the airbrush. but it was foolproof in that my first and last job looked the same; there was no learning curve and settings depending on humidity, temp, thinner ratio ect.
the down side... it was only good for large surfaces, in my case body shells and undercarraiges; wasnt any use for smaller stuff; too big of a spray. I like to spray my dash and even seats, ect. you could do it but youd waste alot of paint, which brings me to point number 2; expensive.
and point number 3; because it was such a large spray and rather heavy; you had to stay away; and with that I found the airflows would sometimes miss the recessed areas; and youd go too heavy on the exposed areas.
point 3 was true of all spray cans. nature of the beast I guess.
but overall; I thought it did a pretty damn good job.