Just got my Droid X last week and I absolutely LOVE it. Couldn't be happier.
My kids also love it, especially all the coloring pages and Talking apps.
Right now, I have one of those silocone covers, which to me seems to protect the phone pretty well. However, I am very hesitant to let my kids use it (ages 7, 5, and 3) without me hovering over them. They are pretty well behaved kids, but accidents do happen. Am I OK with what I have or should I invest $30 in something like the Trident Kraken? How durable is the phone?