RE: Sig Ninja Outdated?
It's a good plane for medium winds. A friend was making fiberglass fuselages for them at one point.
We found it to be a good jack of all trades. Not particularly fast even when ballasted due to the big wing chord and airfoil, but a good flyer and worth building unless you have a special need for super fast, or super durable.
Note BECAUSE it's not "super fast" it is a nice flying plane with friendly habits.