I purchased this product to use with StarSan sanitizer in a convenient size for home winemaking. The first bottle I purchased worked, but leaked from the pump plunger. Thinking it was just a defective pump, and with the price so low, I ordered a second one. It was just as bad or worse. I think almost as much sanitizer comes out to the pump plunger as what comes out of the spray nozzle. I'm looking elsewhere for something that will work properly.
This is the perfect size for filling with a Star San solution and keeping around the brewery and the house. It holds just enough to make it through a brew day and not so much that you're worried getting through it before the Star San goes ineffective. I use a syringe to measure out the correct amount of Star San recommended for the bottle size.
The one downside is that the spray/stream adjustment can be hard to turn.
I keep this full of Star San solution made with distilled water which I spray on everything during a brew session and use to lube/sanitize keg posts. It's big enough to last a while, but small enough so I don't keep mixed solution too long.
I bough this thing a few months back and it had a great misting action with it on the Spray function - then I switched it to Stream function and it has never been the same since... it just sorta spits now on Spray. Stream still works fine though.
I don't think there's anything special about the bottle other than it's a good cost. However, it doesn't spray well unless it's vertical and while trying to sanitize a variety of items I find I turn it slightly and it stops spraying. I think this is because of how small it is, so unless it's full it sucks in air, but it runs low super quick due to its size.