They've been in the rubbish bin ever since we did one not long after they came out, we actually did it twice as we were caching with a Mio PDA that could handle the software, we then went around again a few weeks later with other local cachers so they could get the smiley.  When we did it the first time we spent most of the time looking at the Mio which we felt detracted from the caching experience.  This was confirmed, for us, when we went around again and enjoyed the walk.
I think Garmin have dropped Wherigo from its latest GPS's.
H.