I tried it myself, just as test. Dont suffer from any erectile dysfunction. But for me, Viagra was not a plesant experience. The erection was unnaturally hard, so hard that it was hard to ejaculate and the girl complained a bit as well. Cialis does give a more 'lean' boost to the erections for a longer period of time, making all-nighters quite a bit of fun
Viagra also gave me, what i experienced as higher blood pressure, all flustered and nasal congestion, as pointed out above. Basically, I became a sweating, frusting bull with a
non-yielding boner from hell
Just as a note: if you suffer severe erectile issues post cycle, look into getting a better pct. Armidex, Nolvadex and Pregnyl can help get you back to normal testosterone levels quicker.