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mainegrown has it right. Don't worry about transplanting to a different soil, it's gotta be done eventually.
You can see if they are rootbound by taking them out of the cup, or checking to see if the roots are growing out of the drainage holes on the bottom of your container, there's good instructions here: http://boards.cannabis.com/basic-gro...ency-baby.html
I personally transplant 4 times, makes for a nicer root mass when you let the roots bunch up a few times. I make the last transplant a week or two into flowering. It also helps to keep the soil's ph levels stable, as they tend to drop after a while in peat based soils such as MG.
Great advise my man:thumbsup:My experience is with bonsai trees, so i transplant all the time, but people dont want to with there weed. I re pot at least 4x when i grow outside. I get a good canopy and when there is no room for roots i re pot. After im out of pots, they then go in the ground for the year:thumbsup: its worked for me so far.
:rasta: