I've purchased my laptop, iPad Pro 11" (2G, Cellular), the fancy iPad Pro cover/keyboard, my laptop, and this GoPro, as open-box or refurbished. Not a single item has been defective in the slightest way and I saved hundreds of dollars so far. No reason to pay full-price for these items.Also, before settling on my current iPad Pro 11", I had other versions, all refurbished, all were just fine (no cosmetic damages or malfunctions), and again, saved a lot of money. I was able to return the items when no longer needed at no cost to me.So don't be a sucker- try buying refurbished items first and if something is wrong, Amazon and other stores have generous return policies.Anyhow, the biggest gripe I have with GoPro is their crappy desktop software. GPS signal reception by these things is incredibly weak...although when using 3rd-party apps, I can see GPS data was encoded in the video, but the GoPro software won't ever display it.The Hero 8 is much improved over the Hero 7 and earlier, but the Hero 9 isn't much more than a, "My male part is bigger than yours". Can't watch 5K video in 5K if your GPU and display don't support it, so what's the point? (yes, I said 5K, because that's what the 9 advertises, IIRC) Also, the larger the resolution, the more space you'll need on your SD card.Anyhow, that's my rant. Go away now.

Another quality Tiffen filter, works well on my Nikon 18-140 lens.

Beautiful video. Very easy to use for first timers. Sturdy product. Great size and great battery life

Great for darkening sky and increasing contrast on petroglyphs.

I bought three circular polarizers: AmazonBasics ($13.99), Tiffen ($28.17), and Breakthrough Photography’s X2 ($89).The first test throws out the AmazonBasics due to color problems (it turns everything brown). A weekend of ruined pictures with that filter confirmed this.The Tiffen looks better than the X2. The polarization is stronger, and the X2 appears to be slightly brownish.A weekend using the Tiffen returned slightly brownish pictures. Breakthrough Photography's website shows tests of the Tiffen and their X4 ($129). The Tiffen looks worse at long (red) wavelengths and the X4 looks worse at short (blue) wavelengths.I usually leave my camera on AWB; this weekend I'll try other white balance settings. Also I'll pay more attention to the sun's position and leave the polarizer off when it's not doing anything. I suspect that the photographer's skill is more important than the differences between filters!

Thank you very much! I am very pleased! Good seller!