I love Clinique and over the years, I've used the toners 2 and 3 (although I only used the 3 over my t-zone and once a day, sometimes once every two days 
) and both of them stung a little bit but it went away after a few seconds... 30 seconds maybe?? I guess as the saying goes, no pain, no gain 
........ no, but seriously, in my case I would just stick with it for a while to see if the toner is good for my skin, if my skin gets used to it, it it gives me the results I want , etc etc or if it's too strong to the point of drying my skin out so my advice would be to stick with it for a few days and see how your skin reacts but if you feel like it burns like hell 
and it's too strong for your skin, then just try switching to a milder product like Cliniques toner 1,as some of the girls suggested, and hopefully you will get good results with it too (the toner #1 has really good reviews on makeupalley, they say that even if it's meant for sensitive skins, it contains salycilic acid, which is good to exfoliate, acne, blackheads, etc)
So keep trying different ones until you find the one that's right for you because with skin products I think it's just a matter of trial and error 'cause as the other girls said, everyone's skin is different.
,,,, oh and in my case, toner is a must! it helps my skin look glowy and clean - and slowly and with patience, it helped getting rid of my blackheads (but I also exfoliated and steamed my face regularly)
Hope it helps :)
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