I have been using this product daily for up to 2 hours over the last two weeks and whilst it hasn't helped with my mood or cognitive disfunction, it has had a positive effect on my energy levels and I now sleep much better at night.
The product was just as described and works as expected and, despite the intensity, I no longer notice when its on. My only minor niggle is that it would benefit from an adjustable stand and some means of wall mounting. Also, from my readings on SAD I am unconvinced that blue light offers any advantage over white light.
To conclude; whilst I haven't seen the drastic improvements some people have, it has no-the-less proved beneficial and I doubt that any other comparable lightbox would have shown better results. I am happy with my purchase.