I've used different AS in cycles including Winstrol, Dbol, Equipoise and just about every kind of Test. I've never gotten gyno. I tried Tren a.k.a. Fina alone and got gyno symptoms in 2 weeks. I had done my research and up until that time had never seen any gyno related problems with Fina on any bulletin boards. Almost immediately after I got the symptoms, I began seeing other users post about gyno related to Tren use.
There was a big Tren movement it seems toward the end of last year. I think because it does not bind to estrogen many users dove right in not thinking it could cause gyno. I will coin this era the PGT Era or the PreGynoTren Era*. The world was great. Then sometime in early 2002, a big titty came upon the people of the world. This became known as the PRTG Era or the Progesterone Related Tren Gyno Era*. The world became dark and murky.
O.K. enough drama. Bottom line is, I know it caused gyno symptoms for me. I stopped use immediately and it went away after a couple of months. Many users now say to take it with Winstrol as a PR precaution.
* Notes: PGT Era and PRTG Era are phrases coined by Enigmaxxx7. Patent applied for. Any unauthorized use of these names would be totally lame since the names of these are in themselves LAME. But I couldnt think of anything better at the time.