Hi Bev,
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Honestly, I wouldn't bother with the tria. I tried the newer model last November.
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I have dark hair and light skin, so it sounded like it might work for me. I too only used the highest setting. It is very very time consuming, which I could stand if it worked. One thing you should know, is that the laser is not powerful enough to produce shedding of the hairs as a professional laser would do. Because of this, it can be difficult to tell whether it's working...or whether you're just wasting your time and money. You get maybe 30 minutes of use for every charge, so it'll be hard to do any large areas properly without it taking a good amount of your day waiting for it to charge back up again.
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Pain on arm hair was minimal.
Chest hair? Yeouch!
Anything dark and thick is going to really hurt. (I generally have a high pain threshold, but the chest hairs were worse that electro on the upper lip)
All that...and no way to tell if it's even having an effect on the hairs? I returned it, and decided my money was better spent on electrolysis.
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I would love it if I could do it myself at such a low cost (compared to electrolysis), but I don't see any viable home removal methods out there. Even the more powerful professional lasers are iffy whether they'll work (a lot of people I've spoken with weren't happy, the hair came back, and they ended up doing electro anyway). I may consider learning electrolysis for body hair, but my face is something I'm not messing around with. I'll leave that to the pros.