Of course, it's sort of become an annual "tradition" for my mother and I.
We usually keep it to just the one small shamrock shake a year though, considering how close it falls to the warmer weather where we try to start exercising more.
They're absolutely delicious, although I remember the first one I tried...I thought it tasted vaguely like pepto or something. Of course this was back when I was like 13, so my tongue might not have been able to fully appreciate the somewhat unusual flavor of a mint shake at such a young age. xD
I also find them much less sickeningly sweet than McDonald's other shakes...the chocolate in particular is just awful. I suppose it could just be the way they're prepared at the local store though.