The Interval and X3 fly almost identically (12/5/-1/2). Go with the X3 - it offers more plastic and weight options (13 blends), is easier to find, and costs less.
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FAQ
Is the Interval or X3 more overstable?
They are equally stable (both +1) - turn -1/-1, fade 2/2.
Should a beginner pick the Interval or X3?
Both rate the same for beginners (33/100). Pick by feel and price.
What is the difference between the Interval and X3?
The Interval and X3 fly almost identically (12/5/-1/2). Go with the X3 - it offers more plastic and weight options (13 blends), is easier to find, and costs less.
Which is cheaper, the Interval or X3?
The X3 is cheaper, starting around $15.99 vs $17.99.