I ran into problems with the program being correct when a particular bow didn't reach the performance goals set by the manufactuer,for whatever reasons.I would try and change the ibo speeds to calibrate it and the spine would not change.I ran it all the way up to 400 fps and spine did not change so I contacted ot2 and I was told that they did not use ibo but they used cam style to set spine.


I had to figure out the performance slider on my own which really upsets me that they can't explain how to use their product.[:@]


Archers Advantage uses IBO and if a bow doesn't reach the numbers it is supposed to,just type in what it shoots and you are done,no quess work.Not to mention it is much easier for the average guy to grasp.SO,if I am asked from now on which program I recommend for spine calculations,I am with AA all the way.

OT2 has some nice features but is a pain in the you know what to use.