Stops me from rolling out of bed.

used all three kinds for ED help (viagra, cialis, etc). It DOES NOT make your cock hard, just allows better **** flow so that when excited, you will get hard and keep it longer.
Never been side effects for me except a kind of tingly feeling on my lips. Got a Rx from Dr for generic (real, not mail order) and it's like splitting a regular pill into thirds. Doesn't last as long as Cialis, but works better for me.
--------------------------------------- added after 4 minutes

without that pill, if I don't have some kind of physical stimulation, I lose the erection in only a few seconds. With it, I can do this for many minutes if I have visual or mental stimulation alone.

I have used it in the past. A full dose caused me to get headaches and I had a blue shift in my vision. I reduced my dose buy half and it was better. Still got a slight headache. You do need to be stimulated the same way you would normally get an erection. For me it just makes it easier to stay hard longer. I don't get better erections. I have read up on the other ED pills available and Cialis seems to be the best. You take a lower dose everyday and have it in your system when you need it. As far as it only lasting until you cum, my suggestion would be to take it after you cum assuming you can get hard to start with. Helped me to recover and last longer that way.

Last time when i used vigra, it really helped, but it also gave me pain in the chest and headaches. But its very helpful.

I took viagra, and my nose got longer and harder. Lol

No it doesn't increase the size of your penis but it keeps it rock hard for as long as you're with the person that you took it for. If you were to take it in a grocery store nothing would happen, you require stimulation and attention. I took it once when a friend was coming over and he didn't show but I didn't even get an erection because my penis wasn't being stimulated. I suppose I could have jerked off but I wanted to see what happened. Nothing.
I have taken it about ten times and I like it. I always keep it in my house but I don't use it every time, just when I feel I'll need a "boost". I take it a half hour before the action starts and I'm good for a couple of hours or until I ejaculate.

I've used it but I do not like the side effects. The headaches are pretty intense.

No, it just get up to its full potential, very hard, erect and is extremely sensitive. A lower dose will act like the good old days in your 20s, get hard but go down if you get distracted. A higher dose and its hard as a rock for some time.