They are pretty handy. First time I saw one was when I was on a jobsite with a metal fabrication company trying to figure out the best way to do a handrail and extensions on a complicated winding stair.
the protracators are different from the Wixey angle finder - which is really a tilt meter as opposed to an angle meter.
Similar protractors like this Denali with level bubbles only missing the compound angle calculator go for around $20 or less. Hard to justify $100 or $70 on sale ( that makes it ~$45 for the compound angle calculator) for the sears.
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