TL;DR
PROS: quiet, comfy beds, great A/C, great views, proximity to beach, trails, golf...
CONS: outdated amenities on lower level, broken dishwasher, leaky washing machine, freezer/refrigerator needs to be serviced (doesn't freeze!).
While this was our first stay w/ ESPM properties, it was not our first stay on Kiawah Island (we've actually stayed at multiple houses on the same street). The house's location is great (very quiet, overlooks the beautiful salt marsh, a 10ish minute walk to the beach, close to the bike path and golf course) and it is perfectly adequate for a family of 4-5. Given the limited availability of rentals this year (and price increases...), we were totally fine w/ some of this property's outdated elements (the upstairs is fine, but the downstairs space, particularly the bathrooms, could use updating given the price point). That said, during our weeklong stay, several appliances did not work which was annoying. The dishwasher did not turn on, the washing machine leaked, and the freezer did not work adequately (it could make ice cubes but all other items would not freeze... ice cream was reduced to milkshakes! Nooo!).
Given our stay at the height of tourist season, ESPM could not get a repair person in until a few days after our departure... I will say that ESPM was VERY responsive and even offered to have a person come to the house to do dishes, etc. due to the issues noted above. That said, we did not feel comfortable w/ random people in our "home" on vacation so we declined their kind offer.
Basically, from a utilitarian standpoint, this is a wonderful property for a family (quite comfortable, actually). But if any of the above problems would be an issue for you, I'd recommend confirming that ALL appliances work prior to booking...
In spite of the issues, we had a nice stay, but we'll look at other properties next time.