I have had enough experience to say, laser doesn't work. The term "permanent" is used for something that will last up to 6 months or longer, not forever. I tried expensive laser treatments on my face, ended up crying and forking over $200 a session! Not worth it. No No reviews are awful, my friend works at a place that sells them and he said every single one that is purchased gets returned. Don't bother with it. I don't have any experience with the Tria laser, but I did see commercials and look up reviews, didn't seem as bad as the No No, but still wasn't great.
Removing the hair from the root is what you want to do, tweezing and waxing are best at-home ways. I have been doing Electrolysis for 2 1/2 years on my face, it takes longer the more hair you have and I could have joined the circus... Anywho, the hair is NOT growing back and I shouldn't have to go back after completing the treatments. It does take a loooong time for electrolysis, but the results should last forever.
Here in Canada a new product came out called "Inhibitif" it's supposed to reduce the growth of the hair so you won't have to remove it as often. Not sure where else it is available, you can try looking on their site to see if you can order it.

Hope this helps