The biggest advantage is certainly the ability to skip a bunch of spins and save yourself a good amount of time. This is especially the case if you are tired of the game and want to fully concentrate on winning. Another obvious pro is that you can earn a lot of cash when playing the best high volatility slots.
However, everything has its disadvantages, and these slots are no exception. For example, some of the bonus buy slots run differently, so you may not be able to see the winning round, just because of the nature of one of them. Perhaps, the biggest drawback is that you aren’t guaranteed to get your money back. You can get lucky, win some rounds, and make yourself rich, or lose a significant amount of money. Still, it’s better than if you have lost both the time and money by making endless amounts of spins.