That GeoDesic is pretty ugly in my opinion, and not very userfriendly.
For me there's 2 good classified products on the market:
classipress & oxyclassified.
oxyclassified, is not open source, so classipress got an advantage there.
I don't wanna run encrypted software
and yeah as jomarkosabel is saying, It's a really big advantage, that classipress is running on wordpress.