Great alternative to glass [SEP] I really like these bottles. I've used 2 so far - one for magnesium oil spray and other for a toner. The sprayers work really well - no clogs to speak of yet.<br /><br />I prefer glass bottles when working with higher concentrations of essential oils, especially citrus. However, i usually stick to 2oz or less since larger glass bottles are heavy and can be hard to grasp.  I have rheumatoid arthritis and my hands dont always do what they're told. These bottles are perfect for me - they are light, easy to hold  and the PET plastic is safe to use with essential oils. If i drop them, it won't be a major catastrophe - the bottle cracking is the worst case scenario. Cracking is pretty unlikely - these are sturdy bottles.