Actually it's $189 during the Holiday Season.

It's not just the accuracy that makes it worth the money. It's the dependability, repeatability and the convenience of setting a zero angle reference anywhere so you can make relative measurements quickly. No more plane leveling for incidence measurements. Plus there is a two year warranty.

As far as making adjustments: If you wanted to add a bit more positive decalage you could, for example, add +.35 degrees and then fly to verify flight characteristics. Being able to measure the amount of each adjustment saves time over the trial and error method.

I'm sure there are many opinions about this and you are certainly welcome to yours. Many modelers would not spend $129 for a battery charger either.