Cluster training is an effective tool to shock your body into new gains, as well as break up the monotony of taking a straight sets approach to your lifting. Beyond that, it's cool and different.
This is one of the best in-the-gym workouts you will ever try. I use this style of training a lot with my clients who want to get in super shape in minimum time!
If you really want something significant from your own training, be prepared to put in the time and effort to understand the mechanisms behind your methods.