Yeah, I am in the middle. I don't think they hurt, but considering the price of things like biospira, it is money FAR FAR FAR better spent on some good LR.
Things like cycle...well, I'm not even sure how those would really work.
Consider a QT tank. It is cycled, but you have no fish in it. Over time, the bacteria die off because there is no ammonia to "feed" them and keep population up. When you put a fish into this "cycled" tank you will likely still see an ammonia spike lasting a few days. This is so the bacteria have time to reproduce and "catch up with" the ammonia that has been added. There is a lag time.
I am not sure how this bacteria in a bottle - especially one that is not refrigertated at all (agin the Cycle stuff) can really be all that valuable for similar reasons.
I don't believe in "miracle" cycling in this hobby. get some good LR and let the tank stabilize naturally.