There are other goggles than the Yuneec Skyview compatible with the ST16. In theory all devices with an HDMI input should be fine. I have heard of some rare compatibility issues with certain monitors but so far all devices worked for me.
I have been using the Skyview goggles quiet a while but sold it since I also have a Fatshark Dominator HD3, which I mainly use for FPV racing but it also works fine with the Typhoon H.
The only reason for selling the skyview goggle was that I need the Fatshark goggle, which also offers the same features as the Skyview. Therfore there was no need for two goggles. Still the skyview is a good piece of equipment and has a great value. It is also suitable for other purposes.
The EV800 will not work since it does not have a HDMI input