I actually purchased their "clean up crew" about 3 months ago for my 75 that had been left neglected for over a year, everything had been turned off all that time. Needless to say, I had quite a mess when i finally found the time to clean it and restart it. Every type of algae you can imagine. This "little" clean up crew did wonders, within 2 days the tank walls, rocks, driftwood, substrate, filter intake and outflow, heater, etc, essentially every surface was mostly clean. Within a week I was unable to see any algae and my tank has stayed that way ever since. The nerites are awesome cleaners tireless really. I am also particularly fond of the golden algae eater and the gara ping ping. The shrimp are just plain fun to watch. Overall, I am quite happy with my purchase.
I will tell you though, the otos are back ordered and have been since I originally placed the order. I'm still waiting on them. Although, they say they hope to have a batch in within a few weeks. They have been very responsive to every inquiry I have had and seem to be willing to do what it takes to ensure I have a positive experience with them.
I'd recommend them. Oh and btw, the nerites do not reproduce but as stated earlier, they do leave little white speck eggs all over all the time. I don't mind the eggs they dissappear with in day or two. They also have done zero damage to any of my plants. It's fun to watch them cleaning a sword or crypt leaf as obviously they are heavier than the leaf so they end up upside down hanging on for dear life, frequently they fall off and float to the substrate. Despite this, I have had no broken leaves or any other type of damage.