As investing goes, I'm about as small-time as it gets. I don't own any ISRG, but I do have a small stake in Titan based on speculation that the first viable competitor to ISI will do relatively well based just on that fact. However, I have been in OR device sales for over 10 years and have seen the balance of power shift significantly towards products and companies that provide economic value in addition to superior clinical outcomes. Surgeons may enjoy the better visualization and range of motion provided by daVinci (not to mention being able to sit down for several hours) but, at this point, there really isn't any compelling clinical evidence that outcomes are better than straight stick laparoscopy.
This might not be an issue if the cost were the same, but the fact is that robotic procedures are substantially more expensive on average. Forget about the $2500000 capital acquisition cost and the annual service contract, I've seen invoices for their disposables. Just openning the drape for the robotic arms and camera (basically a plastic bag that covers the robot and maintains sterility) and all the other disposable accessories needed for the case is at least $2000, and all that stuff gets opened before they ever even attach the endowrist instruments that cost $240 (and up) per surgery. This is all in addition to the set up costs incurred for a normal surgery. I don't care how you spin it, there is no f-ing way this is even close to being cost neutral for the hospital versus traditional laparoscopy. Google the Pasic study from Journal of Minimally Invasive Gynecology if you want details.
Ultimately, daVinci is amazing technology that is innovating surgical care and robotics will always have a place in the OR. ISRG has seen tremendous growth and made investors a lot of money, but at this point, every hospital in my city already has two daVinci systems and they are booking silly cases on them (lysis of adhesions, oophrectomy, lap chole) just so they don't sit idle...gotta justify that huge capital outlay. I've had more than one OR director tell me that they're losing money on their robotic program, but have to keep it going to be competitive with other hospitals. Not a sustainable business model for the long term, in my opinion. I think a lot of the points made in the Citron article will prove to be prophetic, and we haven't even begun to feel the effects of Obamacare. All makes me wonder why so many analysts list ISRG as a buy.