Every review on the teleporter series I have seen have the same reviews. They work good and are ok for starter gear. But it is not very long before people hate them for the low res specially once they saw something to compare them to.
Things to consider is IPD adjustment or fixed.. Do you have a fat head? close spaced eyes, wear glasses ?
Resolution, wide screen or not, battery use, diversity or not, and finally price.
I have a weird shaped head so I HAD to have IPD. I used a 7 inch monitor to break into FPV and that worked well but lugging the gear around was a pain. When I made my decision I went with the Skyzone's because they were over 100 dollars off where I got them, they had good reviews. They have diversity receiver INCLUDED not a separate purchase like fat sharks. They were NOT wide screen.
I did not want wide screen as to me the video is smooshed vertically which along with the fish eye effect of every lens out there on the cameras that close to ground distance was skewed. Also the wider the FOV or the screen the faster you perceive things passing by. Take that away with a normal screen and you SEEM like you are flying slow but you are not and can be more accurate due to less compression of the top and bottom of the screen.
That's just my thoughts now that I have a pair and compared them to a monitor which is what you get in the head play style goggles.