First, let's clear up the differences are between toners, fresheners and astringents.
Astringents are usually for oily skin and are often designed to fight acne or control oil.
Of all the extras, salicylic acid can be most helpful for blemish prone skin since it penetrates the pores and helps clear out the dead skin cells and bacteria that can cause pimples. Having said that, there are a few toners that I do like, for specific reasons. If you decide to add a toner to your daily skin care routine, make it one that really suits your skin and its needs. Always choose something gentle that doesn't dry, strip or otherwise irritate your skin, and don't spend a fortune on something that is basically souped-up water.