Look at Andy Duffy. Only in trap is the auto not used much by the top guys. There are very few autos. It's money well spent. Shooting a gun that doesn't fit you is like running a marathon in someone else's shoes.
Shooting is supposed to be fun.
Besides, you'll never get any good waiting to get whacked upside the head every time you yank the string. Life is short. Spend the money. Do it right.