Keep in mind, Mast is a little hard on BP -- one of the reasons why you get so vascular. Other than that, it's pretty mild in reasonable dosage. So is winny in spite of the 17 AA. I wouldn't use either one for more than a month.
Probably has a lot to do with the individual as well. I've never encountered a negative side from Masteron. Even my blood pressure was checked by a paramedic (work accident, long story) a month into my cycle of Test E at 600mg, Tren E at 400mg, and Masteron E at 400mg and it was still on the low and good side like it always is with me at 110/58