I was skeptical too. I sighted my bow into to 60 yards by shooting it at my outdoor range. I then asked to confirm it with SPAL's do-hickie machine to see for myself. Not only did it come close, but it was dead-on, exactly the same to the micro c-hair. I was impressed. Others I know have had the exact same results. I didn't believe it either until I validated it for myself.
The guys enter a bunch of data: arrow diameter, spine, height of peep above centreline, arow velocity, and a bunch of others parameters, and click, click, click, it spits out your bows pin gap requiring you only to sight in to 20. Pretty neat deal.
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