It's hard to answer this question without knowing the details of how the deal is structured, the circumstances for the buyer and seller, and how selling price is determined. Every deal is different. For the seller, rent with an option to buy can help secure on-time monthly payments with a potential purchase at a price that is acceptable. The negative aspect is that the seller can miss out on potential price increases for a future sale. From the buyer's perspective, it can force them to save a downpayment and not have to move when the lease is over. Some will argue that option to buy may put the buyer at risk of paying too much, but appraisal contingency should help mitigate this exposure.
Let me know if I can be of help, buying a home doesn't have to be a scary endeavor.