With free classified ads and free website there is no concern about the cost of posting or publishing their advertisements its almost free . Free online classified advertisements or free ads posting website are very common now days, as they are very economical and help the businesses to reach mass customers in less time and these website already have a lots of traffic with already.
It is sure if you are posting Good thing posting free classified ads, Since they are free & giving local and global exposure short of time in for your Product Or Service. Try to post Proper information about Product Or Services , Contact details, Also choose good Images related to your product. Some sites allowing add website links also, You may not get any back-link but still you will get more and more visitors from Targeted Audience.