I've thought about getting one of those but didn't feel like spending the money. I don't know that you really need it, it's more of a convenience thing I guess.
Not sure I know what you're referring to regarding "different sized circles". I'm guessing that you are talking about either the pencil tool or the airbrush tool in PS? It's next to impossible to get a nice, straight line using those. You need to use the bezier tool (looks like a pen) to create an adjustable path. Then you convert the path to a selection region (in the path toolbar) and use the stroke command (Edit menu-->Stroke) to make a line....sort of a pain but it's easier than redoing your pencil line 50 times to get it to look right.
As far as doing an airbrushed gradient, make the airbrush large and feathered towards the edge (like an airbrush). Then use your eraser to remove what you don't want. To make a sharp edge, follow the instructions for the path selection above.
Hope this helps.
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