Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Best of the Best

I've used Prime for the past 15 years on every fish and shrimp I've kept. It is by far the best on the market, and the most affordable. There may be conditioners that cost less, but consider that normally you need one cap full for every 10 gallons. With Prime, you need one cap full for every 50 gallons or so! For big tank owners, that means I can do a 50% water change on my 120-gallon and use 6ml of Prime vs 30ml of any other product. Even the smallest bottle (100ml) will treat 1,000 gallons!I've read some complaints here of the smell, and it does have a sulphur-like smell. The smell is NOT transferred to the water, and of course goes away when you cap the bottle.This is the only conditioner I'll ever use... it is effective, safe for even my most delicate ornamental shrimp, and by far the most cost-effective product on the market.