I only used the roller on the base white - 2 coats and actually really liked the results.

Used spray cans for the colours and more than happy!

Only issue is with cans they only come in gloss but wouldn't have it any other way! 

Tony -Will have to come over before expo to see how the latest project is coming on.Just a note on that gloss look on your colours - as you are aware I am in the process of doing the transfer method on my Jumping Jack front cab (Will keep updates on this method) and noted when I clear coated the transfers I used Satin instead of Gloss & found they came out without the high gloss -maybe you do a final coat of the satin clear to remove that gloss.
Kev