I recently bought three of the blue ones from FastTech. They fit my C8 and my S2, but not my M1, or M2, due to the circuit board being smaller in diameter than the stock switches. There’s a hollowed out shelf on the back of the two retaining rings that when cinched down, don’t make contact to complete the circuit.

I could probably fashion a thin shim/washer to get it to work, but ehhh…

As for my two S2+ lights, things look a bit funky from the start, after removing the button. There’s a sleeve that needs to be removed and I didn’t bother mucking with it.

I’ve got a spare blue switch, if one fails, but that was my experience earlier in the month.

I like the blue, but would have ordered an amber, if FT had one, but they didn’t.

Chris