Playa Conchal, and yes, we were pretty happy.
In the end, I think we probably aren't really the all-inclusive types. We like to adventure into town and get more of a local flavor.
But the kids enjoyed it, and it was very relaxing. The restaurants were actually better than we expected. Service around the resort was just OK - there were a few maintenance issues that, while they did get fixed, took a bit too long.
Pool was nice, crowd was fine. Beach had a red tide while we were there, but it was still pretty good. One day we went to Playa Grande, which was just a perfect beach for boogie boarding.
We never ventured to the Hilton, so I can't compare, but for the price, the Westin was fine.