To try to sum up. It is still best to take off from a fairly level surface. The gyro initializes while the 4-in-1 is going green. It is designed to maintain rotation so if it's uneven when it initializes it tries to get back to that uneven state, so to say. Since we don't intentionally fly tilted, this doesn't include flips, rolls and inverts on purpose, the gyro is trying to maintain rotation at the point where it initialized. It's my understanding that the pro is wired to accept an HH in line without any other modification, however the stock bcp is not. You have to disable the built in gyro in order to go to HH, which basicly means going separates. I personally plan to go BL with a Telebee HH gyro. It's small and light and very capable of handling the blade. A freind of mine has one on his Trex and although it may be limited for the size of the rex it seems to work fine for his level. Some times if your bird acts wierd when you boot up, just disconnect and let it boot again.