It works well and the pad is not too big. It takes a little bit of pressure to activate the light but that helps from accidently activating it. Have not had it very long so don't know its about durability.

I have 6 of these on all my pd35s I use for bowfishing and never have any problems with them.

Came broken on the cable that connects to switch. I glued it back on now it works. Not worth my time and money to send back.

Does not work out of the box. The connection is not made with the tube / body of the flashlight. I had to take household copper wire, wrap it around the flashlight to make the shape of a circle, and slowly work it into the bottom of the remote switch inside; a total of two c-shaped rounds. Then, the body screwed in would make contact with the inside of the tail cap. With out this copper wire, modification, the body screwed in all the way still would not reach the inside of the tail cap. Using a multimeter, there's no conductivity through the threads, because the threads are painted black.

I use this on my PD35 V3.0 and it works perfectly. The pressure pad is silent and doesn't require too much force to turn on. My only complaint is the lack of a mode switch which I believe is addressed in the new version (Fenix AER-03 V2.0 Remote Switch). The fit inside my pressure switch mount (Fenix ALG-06 Pressure Switch Mount for M-Lok Rails) is snug enough that it can't fall out, but is easy enough to remove when I want to.