Besides the price...the price, the price and the price. They are really expensive for what they are. I'm not sure if it was this model, but I tried some on at a trade show once. They were OK I guess. I have the DJI Goggles which I love and give a better image I think. The advantage of these is because you can see through them, you can use them on your own because you can still have VLOS on your drone and so stay within regulations.
BT35E are the best fpv glasses I have ever used like said above the price is crazy expensive but awesome like the DJI Goggles you sweet in them the screen fogs up the bt35e just like sunglasses and I love being able to see my surroundings and if you get a set purchase the right USBC cable I use the USB C to HDMI Cable[3.3ft], JSAUX (4K 60HZ)Type C to HDMI no lag when flying.