If you haven't come across the Tizen Experts site yet and are interested in latest Samsung Gear info, how-to videos, app reviews and free Gear wallpaper, be sure to check out Tizen Experts | Tizen, Just one Byte at a time. I don't work for them, I just like their site.
I do not want to try from other devices... Is it a high risk website, or is it safe?
I don't believe it is high risk. I've seen many people on this forum post info from the site. I did test it for you today, however. I usually use my Note 3, but I opened the page today on my home PC, a colleague's iPad, My Note Pro12.2, my work MacBook Pro, and my work iPhone 5s. No problems opening the page. I personally feel very safe. But that's me. Maybe others here can reassure you? Hope this helps you.