I have 3 Ultimate’s and it does take a little bit of differences in setting up Bipes since you have 2 wings and 4 ailerons to check to see that all of them are going up and down the same amount. Same as a mono is to make sure it has the correct up thrust, right thrust, and CG is the same for any bird. Most Ultimate need and also are designed with up thrust in the tail and different kits will carry different amounts on each wing that need to be checked. The rest is fly it and adjust as needed if your also run mixes as with any bird….and need it talk at you