Lease to own (lease/purchase)

Anyone here have experience with a lease to own? We have a rental property that we've recently considered selling, until we were approached about a lease to own. From what I've read, it seems like a good deal unless we have our hearts set on selling. If we are not opposed to leasing and would consider selling at a later date, then why not enter into a lease to own? It seems the worst that could happen is the tenant deciding to walk away after the lease is up. Am I missing anything else? Talk me out of it...
Thanks for the info!