I like cialis, but will add a low dose of viagra once in a while if I've had a bit too much to drink. That's usually the only time I might have a 'failure to launch'.
I like to keep nitric oxide up for vascularity, blood pressure, and erection quality, so I take a stack of Arginine, Citruline, Horny Goat Weed, and Pycnogenol. I take that in the morning when I wake up, then take it again in the afternoon adding a low dose (5mg) Cialis. Then again in the evening. That keeps nitric oxide pumping all the time. Always ready to go, great pumps in the gym, and helps keep BP in check.