Just tested it yesterday and … Can’t say I’m impressed so far (hoping for some improvements).
I had the do more cutting of the face bracket than I planned, basically severing it at the top, because keeping even a thin horizontal part would press the ET cables, and raise the ET inserts. Even like this, the left insert isn’t perfectly stuck to the lense / ET bracket.
After that, calibration.
I had to put the headset uncomfortably high on my face for it to start (without talking about not being aligned with the sweet spot of the lenses anymore). Even like that, the calibration was stuck after a few dots.
Eventually, managing to restart it and complete it several times, the tracking lacks precision since I can see i’m a little off from the 7 dots that appear after calibration.
Then the game. I only tested Alyx, putting it in aggressive mode, with Large FOV @ 90Hz.
I must admit I wasn’t bothered with the refresh rate. At least, I didn’t noticed any lag in the shading update like some have experienced (the ET module is plugged directly into the top USB port of my 5K+). I even doubted fovated rendering was running at first, but then I would notice it on far edge of the screens, and it seems that the ET cannot track that I’m looking that way to shade this part at full res.
This is disappointing when we know the offered ET eventually became a discount because Pimax had to change their plan to make the ET module compatible with the wide FOV of their headset … which is not.
Due to the way DFR works, low res aliasing at the periphery of the vision is still distracting, but way less than it was with FFR (that I ended up disabling because of that).
I will have to do more tests, with different settings (FOV, FR mode, Image quality) and different games.