I've had a 4X, M8 since the late 80's. It BTW, is a 28mm, not a 33mm. I've got two FX2's, 4X's. All of them have been knocked around pretty hard. That means hard impacts during falls where the rifle was pitched to allow me to break my fall. None of them every broke anything or even lost zero.
The FX2's are brighter. They work fine with the standard duplex in legal light. the Fx2's allow me to see at night, BTW, but the M8 woks less well. I can see the reticle in the M8 even outside of legal light hours thanks to the addition of a Post and Duplex improvement.
The M8 has a longer eye box, which I really like.
Argue what you like about the adjustments. Once I set them, they stay put for years.
None are for sale. E
