I give it high marks for being safe for fish. For transparency though, I am just taking the product at it's word. I've only been using it for a couple weeks.
I give it an average score for effectiveness. It cleans my tank glass fairly well. It's not the best cleaner I've ever used, but is definitely better than a bottle of regular windex. Considering it limits itself to ingredients that are aquarium safe, I'd say it's understandable that it isn't the best.
I am not a fan of the spray nozzle. It doesn't creat an even spread of product. Some of the targeted area gets a good misting, while some gets a messy drizzle, and other parts don't get any product at all. It's a small complaint and doesn't ultimately detract from the effectiveness. But it is a user experience issue.
