I use it every single day on my main account. So does my entire group of friends/followers. It is a 'hack'...there's nothing you can do to prove that it isn't. You won't get banned as long as you're not stupid when using it (and only then if you actually get reported).
This obviously means that the turn keys (A/D or left arrow/right arrow) are getting sent correctly (making your character jitter) but the memory editing isn't happening. The most obvious thing I can suggest is to try running it as administrator.
Funny thing is that your case is the exact opposite from the person's above. Your memory editing part is working correctly but the keys to turn your character (and update his position which is why you see it on your screen but your friend doesn't see you in the air, the character didn't make all the turns/jitters/fidgets to update his position) aren't being sent. This means that if you're using the A/D version then you have something bound to the A/D keys that isn't turn left/turn right. Use the right version that you need. The keys must be bound to turn left/turn right. You have 2 choices: A/D and left arrow/right arrow. There is a link for each version in the OP.