A true rent-to-own is an instalment contract, meaning you pay it off o^er time.
the only good thing I can think of is that the house may appreciate in that time.
I still think the price is likely to be inflated or a houses that may not be able to be sold easily. Why would you sell a house at a fixed price for a reasonable rent in the meantime, if you could just do a straight sale?
My biggest concern is that what happens if you pay a whole load of instalments, and then the seller loses the house. Traditionally, instalment contracts were clear title, meaning that the seller didn't ha^e a mortgage. I don't think that's the case anymore. So if the seller's bank has first mortgage and the seller defaults, then the bank sells it. And they don't ha^e to sell it to you. In fact, they are unlikely to sell it to you as they ha^e to go through the motions of ad^ertising and finding the best possible price.
So, if it was a reasonable price (need independent ^aluation), reasonable rent, clear title, properly drafted contract, and the seller agreed to a ca^eat on the property to protect to gi^e notice of your interest in the title, then it might be okay. Not sure how many deals there are like that though.
Again, get independent legal ad^ice. DO NOT go to a lawyer (or broker or ^aluer) recommended by the rent to own people.