Ok well I don't feel like playing semantics, but its not uncommon for people to include the triggers when they state "buttons" on a controller. And also, since the X-Arcade obviously has to have buttons that are used for the triggers... and the fact that I'm pretty sure those buttons are NOT pressure sensitive like on the Xbox pad... makes me think that it is still very relavent information to think about when buying an X-Arcade for use with an Xbox.
And, off the top of my head... Dead or Alive: Extreme Beach Volleyball uses pressure sensitive buttons, as well as at least one of the Baldur's Gate games that I can think of. The DOA fighting games may also use them IIRC
There ARE games that use it... so it would be a feature people might want if those games are what they are looking to play.
I never said that there were no games that used them. I said there are none that require them, and that is very much a true statement.
DOA:3, DOA:XBV, and DOA:Ultimate all have an option for use of pressure sensitive buttons, but there is nothing in the game that can't be done without them. They just shorten how many buttons may be required to do something.
Triggers are definitely NOT buttons, but I can see what you are saying, that some would include them in with buttons. You obviously did.

The wording of his question made me think he was asking specifically about the face buttons though, since he said pressure sensitive buttons, which is exactly what they are on the Xbox pad.
Either way though... The main answer was no, they are not pressure sensitive on an x-arcade.
Games that use analog triggers are not well suited for arcade stick & button controls anyway.