I get a script for 16 tabs of 100mg each and it usually runs about $210 with dispensing fees.
I started using it just under a year ago, when I got back from my Thailand trip. My dick was worn out after that experience and never seemed to fully recover.
I knew it was time for action when I had a lot of trouble keeping it up during a session with Samantha Jones. If you can't keep it up for her, you know something's wrong. I was able to accomplish my mission, but it wasn't easy. I got some samples from my MD the next day and haven't looked back since.
I cut them, but since they're not scored, I get two unequal "halves". I usually take the bigger one, so I end up with 3 doses out of 2 pills. I get rock hard. It doesn't make me cum any quicker, but I can recover quicker. What I do find is that the effects must last at least 12 hours for me. I'm raring to go even by lunch time the next day.
As for heart dangers, I wonder if the largest risk may come from the fact you feel so sexually invigorated you may push youself to perform beyond the limits of your current physical status. Admittedly, more fun than shovelling snow, but probably a valid analogy.