you will learn to fly smooth without it, if the gyro makes you look smooth you will just delay the learning to fly like a pro because you have to re learn to fly without assistance.
If you want to look good and are actually not, then the gyro can do that for you.
Its like leaving the training wheels on your bike.
Just my opnion, but dont know any good respected aerobatic pilots that need or use them.

Normal size rc aircraft wont need them, but have seen the benefits on the micro stuff as they are so sensitive