I bet one can find at least a dozen posts by me stating that Zeo is not required, a waste of time, money, etc.
But, I figured I'd put my money where my mouth is, and took my LFS up on a great deal.
Within 2 weeks I noticed colors that I've never been able to get in my previous 9 years of keeping SPS. I did not get an increase in growth, I agree that too fast is not good, and I've developed patience over the years
Overall, I'm impressed with Zeo and will continue to use it.