Funny I just saw that advertised on Facebook today. I think it's crazy expensive for the amount of time it saves, as only someone doing several a day will benefit, but they're already skilled at cutting for a box. I'm slow and I can mark one level, and hit it with an OMT plunge blade before I'd have that thing chucked up.
That said, I do use the Q-Bit now and I like it. No moving parts, 1/5 to 1/6 the price, and fits in my tool belt.
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