I've just run a test/EQ cycle and used finpecia. I was a little concered that it might affect the gains. It did not.
I used finpecia as opposed to Propecia as that is far more expensive, for what amounts to be a generic version of Propecia.
I bought from this firm below, no problems at all with the order.. It's manufactured in India..Took about 10 days to arrive
http://www.inhousepharmacy.co.uk/hai.../propecia.html