i've had hesitations using proactiv at first coz i thought it's just another one of those acne products that's being marketed on tv. however during my case of bad adult acne on the cheeks, i started using it.
my face basically is oily. i live in asia where it's humid and warm. and so the drying effect is actually a blessing for my situation. i've used 3 60-day (but it stretches to 90 days on the way i use it 2x a day) supply box sets and the effects are good. i was just about to open my 4th box when i thought i'd stop using it for a while and try using Oil of Olay total effects so that my skin wouldn't be too much used to proactiv (coz just like fellow frequent users of acne medications, my skin tends to break out when it's too used to a specific regimen.) after a while, i plan to go back to using proactiv.
one suggestion tho, try washing your face with liquid soap (like clinique liquid mild facial soap) in between the renewing cleanser (cleanser- the step one) coz it's an exfoliant and too much scrubing on facial skin sometimes can worsen open pores when acne is present.
bottom line i guess is, if you'd tried many acne medications and still can't come up with satisfactory result, try proactiv. and remember that it takes a while for acne to totally clear out. don't expect overnite miracles to happen.