it goes very fast in and out.
when I pull down the bar to power up for the jump, I hook into it.
Before landing I hook out of it.
A stopper will work as well, but will make the jump less steady and stylish, in terms of smoothness (the pulling down and up part will look shitty).
And with a microloop you have more time for the trick, so more you make it look more stylish and hold the position longer.
If you want to advance, a microloop is your only choice.
I wish I had a micro loop (or at least an option for it).
I can't manage to use the stopper ball (which are actually two pieces on my Epic kites).