I've been skeptical of those, I'll have to try one out. I bought a roto zip tool a few years back, thought it was going to make my life easier, biggest POS I've ever bought, only thing I've found it will cut worth a crap is sheet rock. I even tried the carbide bits, all they did was break. For rough cutting fiberglass, I've got a home made tool, combining an old shipyard angle grinder with a 4 1/2 carbide saw blade, looks real mean, would probably give an OSHA inspector a heart attack, It cuts quick and makes large chips rather than fine dust, it doesn't make you itch as much, but you have to be carefull with it, its not for the faint of heart to use
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