It seems to be on par for price with Pepakura which seems to be more popular, but it's all up to what you're comfortable with.
It looks like Ultimate Papercraft 3D has a free demo.
Ultimate Papercraft 3D
I recommend trying it out for yourself to see if it does what you want it to and then decide if its worth the money to you.
You do realize that this isn't a complete paper model creation package - you need to create the 3D model in some type of CAD program first, then export to this to flatten it - like Pepakura. Make sure this program can handle the format of the models you're creating.