I did it, it works. I took it for 6 weeks in a row and had no period, but had irregular periods ever since (stopped in August and got pregnant in April).
It may or may not work depending on your body and how long you've been taking it. I was on the 3 month packs and switched to a cheaper brand and just kept up with doing 3 packs and then off for a period. It worked for me.
No, it's not good to do all the time but once in a while won't hurt you.
I tried it once 'cause I knew my period was going to fall on a certain date (our anny? V-day? Can't remember)... so I tried to skip it, but it didn't work. :(
I'm actually trying this right now. I had by annual physical and the gyno said it was safe. It typically won't work as well if you have the multicolored by the week pills because of the hormone changes on those, according to my doctor. I'm hoping this works for me