We've tried many different things and this is by far the best. Neem oil sometimes works, sometimes doesn't and leave a oil residue. The non-organic version kill the mites right away but they always seem to quickly come back. Kapow is good but really expensive and not as effective. Same with Green Cleaner and various azomite formulas.
The cap fits nicely and even came with a gasket for a good seal. It appears to be very weatherproof, and sturdy enough for a little abuse. No complaints there. The issue I face is that air does not return into the bottle as water pours out, and eventually, the water flow stops. The 'auto' watering feature is disabled, the only way to correct it would be to manually let pressure in. A larger hose would help resolve this problem.