LAS - Can't remember whether I showed that (I think I did) and had no issue
LAX - Guy couldn't identify it, called over another agent for help and I told him I had DL too (was running really late)
MIA - Not a second glance at the TT line; accepted w/o question
I like using this instead of my DL since I keep it in its RFID protector sheath rather than my wallet so I can have my wallet already tucked away when I get to TDC station.