a while ago i got profix to do my air con regas. fair enuff it had to be done and the boss was paying for it $150 all up including the dye so we can see if there were any problems.
took it back for a check up and asked em to do the fuel mix and timing becuas ei couldnt be stuff.
they said they couldnt do it until i got my exhaust leak fixed, the leak was supposedly cause by a hoel in the extractors. $400 was the quote to fix it.
just took a look at it myself and fitted a new manifold gasket. what do you know problem fixed.
moral of the story. unless you want a specific service done don't use them.
as i have just saved $275 by doing it myself.