I personally own both ESV and RIG. I don't know a whole lot about DO. What I do know is that, despite oil being near record highs for the last 3 months, despite these three companies making good profits, and despite buybacks all three of these drilling stocks are at 52 week lows, in terms of their pps. From their performance, I must say that I don't have a lot of confidence in any of them.
However, remembering the old axiom, "Buy low" maybe now is the time to buy. It's certainly not the time to sell. Personally, rather than DO, I'll stick with ESV and RIG because their dividend payouts are much more generous than DO's. And these dividend payouts ease the pain of the drop in pps. I also have the divvys in their respective 'dividend reinvestment programs' so, in actuality, I am buying more shares at a lower pps.
One point I forgot, all three of these stocks are at their 52 week lows, in spite of all Market Indices being near 'all time' record highs. So these stocks are definitely dogs of whatever Index they sell on, totally non performers.