I rode this trail for a week in February when I was out on vacation in Green Valley. Bring food and lots of water. You will probably poop out before you reach the end. Those who gave this trail a low rating aren't real mountain bikers. And no one mentioned the scenery, which is great.
Some parts are very rocky, but whoever said it was too sandy got lost.
It also has fast smooth sections, and every kind of thrill you want. It is also far enough away from Tucson, that you are in a very natural, peaceful environment without a lot of other people around. It is great. I rode here again in April and it was way more sandy than before. Long, slow sandy wash.