I've always liked extensions catalog pages, for example K2, eshop, Vituermart, etc.
Still I found the Jom Classifieds excellent component which is very easy to understand its operation and is highly appreciated in the JED.
With all this, in my very personal opinion I feel that it lacks many extra functions or possibly should create additional extensions to complement and thus remain the best in your area.
Also consider that the component is updated very recently.
Remember there are extensions like k2 and some other extensions that have endless applications to complement them.