Mine too! I'm wearing it right now
I only have a few (Stereo Rose, Light Year and Redhead), but I wear LY the most often. I've been wearing Def Def to death since buying that; I think it's tied for my fave MAC highlighter powder (with Shell Pearl).
Edit: I just went upstairs and tried Redhead again. I like it a lot too. I think I'm just getting used to highlighters; I didn't wear them (ever) until very recently. Until last year, I wouldn't even wear a blush that wasn't absolutely matte. Maybe I'm just learning to like the look on me.
I do need to be careful because I'm getting older and I have enlarged pores from having oily skin for so long (although my cheeks are normal now), so I just stick to a light-handed application along my cheekbones with a fan brush. My old matte look seems flat or incomplete to me now; I always reach for a highlighter, even for work.