Beastie blooms and cha ching are worth it. They both add a nice boost of phosphorus and potassium. The thing I really like about cha ching is it has a 9 nitrogen content. It is used in late flower right up until flush. This supplies the plant with a little boost of N during late flowering, just enough to keep them looking nice and green all the way through. one of the biggest mistakes growers make IMO is depriving the plant of nitrogen in mid-late flowering. Nitrogen is essential and plants will not reach their full potential if they don't receive a little N. That's why I like cha ching. Open sesame seems BS to me.