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I don't have any first hand experience with these, but after reading this thread last week, I decided to find out what I could about it.
All I've found out so far is that it must work at least a little, because they carry them at the art store I frequent here in town, and if it was a useless toy, I doubt that they'd have it there.
Anything past that, I don't know.
Hope this helps a little.
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it's all about self-indulgence
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