Pepakura is trusted and tested, that and Rhino are the two unfolding tools I use regularly. Judging from UP3's feature list it's pretty similar to Pep so anyone intending to get their first piece of software could consider this an option, but those who already have Pep have no reason to change.
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"The world is big"
On hold: Fuyuzuki, Zao, Zara, Akizuki,
Past works: XP55 Ascender, CA Ibuki, Seafang F32, IS-3, Spitfire V, J-20
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