I use Postlets for all my property listings. I have never represented a rent/lease to own, but I use it on all my rentals and sales. The ads are professional looking versus just placing words and pictures in an ad placed anywhere. I place these ads on Craigslist, but Postlets themselves feed out to numerous other sites that I also get responses from.
If I can answer any more questions about postlets, or if you need help with this, just give me a call. Cyndi