I use a patch changed every 3.5 days too; I've never tried any other method, but I love this one. Nice steady constant dose, one of the safest ways of administration, and I don't have to remember my meds more than twice a week (I'm forgetful).
I use the Vivelle Dot, which is *tiny* and stays stuck just fine. I did have more trouble with adhesives with the generics for Climara, and switched.