Pro Edu managed to turn their Commercial Retouching Workflow Tutorial into a series of plugins. That's not to say you should pass on these plugins, if you you've seen that tutorial. On the contrary, ToneLab and EdgeLab actualize and organize those processes and workflows taught in that tutorial and makes them more intuitive. These plugins are for those who know how to drive stick, but would prefer to drive automatic. That's not to say that these plugins are like that driving experience where you hop in your car, blast some music, shout along and then look around and wonder, "how'd I get here?"
You still need to be an active participant in the planning of your retouching workflow, ToneLab and EdgeLab just manage a lot of the stuff that's going on under the hood so you can just focus on the intuitive parts.
GrainLab addresses how to apply grain, much in the same intuitive manner as the other two plugins. ToneLab and EdgeLab alone are worth the price and you shouldn't pick up one without the other, they complement each other. At their current price buying the bundle vs. buying them individually makes purchasing them as a set a no brainer.