We wear matching claddaghs, and have for just about 2 years (after having dated for a year and a half). Not exactly promise rings (it just seems like something 18 and 19 year olds do, and we were far from 19 at that point!), and we'll probably wear them after upgrading to platinum solitaire and bands.
I didn't ask for one--he asked me if I wanted one, and then I asked him.
There's just so much I want to do (ie, get out of graduate school, be able to pay rent in NYC without my parents' support) that a claddagh suits me just fine. Not in a hurry at all.