On a recent trip to Florida our family rented a Model S for a week. The first one we reserved a few months in advance. A couple weeks before departure, the owner messaged me to say that his Model S was totaled in an accident. I feel bad that his Model S was totaled and am grateful he gave me as much notice as he could, that would suck. Thankfully I had enough time to line up a second car, but the fact that their isn't much of a backup if an owner's vehicle is out of commission at the last second (as an earlier poster related) is always a consideration. After a long day of flying my family would not have been impressed with me if the Turo car hadn't come through. With Hertz et al if the car you reserved got totaled the day you were to pick up your rental, I'm sure it wouldn't take them too long to arrange an alternative vehicle. With Turo, not as easy.
The car I did rent was fantastic and it was great to have an extended drive of a Model S. We're going to Chicago next month and I've reserved a Model 3 on Turo and am extremely excited to try it. It will help me decide between a Model 3 and S for our family (Model 3 reservation - late 2018). I hope that rental goes as well as the Turo rental in Florida did. I'm really looking forward to the experience.