using OT2 pinwheel software for proper arrow spine

anyone have OT2 pinwheel find it to be spot on. I am trying to build arrows for this year. I know the arrow charts on manufacturers websites are just starting points and changes may be necessary to you set-up. wondering if it is worth the investment in the pinwheel?

OT2 is pretty good. The default specs for a bow are close. From there tweak according to exactly what your bow is and either adjust the performance or tweak the ibo speed to match what your bow is actually shooting. Once the inputs are set it does a really good job at spine selection and predicting speeds for other setups. Like most things it's only as good as the data going into it.

Archers Advantage is its own program.

Is Archers Advantage a new improved software by OT or a different program all together? If anything they are fun to play around with.

Archers Advantage

I have a version from 2009 and I really liked it. My research said it was very accurate and I found the arrow speeds to be very accurate.