Yesterday, in response to Chasing Value: ISRG is falling and I'm buying I received the following comment from Beltway Greg, "You're a brave dude. Why? I've watched this stock for awhile and I worry about possible entry by other folks into the market."

Brave perhaps, even foolish on occasion, but I still think this is the time to be selectively buying equities.

To those that might be concerned about competition for Intuitive Surgical Inc (NASDAQ: ISRG) you will be interested in the following:

• NOTICE TEXT: Department of the Army U.S. Army Medical Command MEDCOM, North Atlantic Regional Contracting Office Subject: Contract prosthetic feet and leg coverings This is a notice of the Governments intent to solicit, negotiate and award a sole source contract (Note 22) contract to Intuitive surgical for Implants based on urgency. This is not a set-aside for small business. This notice is an urgent requirement for Walter Reed Army Medical Center, 6900 Georgia Avenue NW, Washington, DC 20307, contract number W91YTZ-09-P-0147. Parties interested in future announcements shall provide detailed information of their capabilities and certifications to clearly meet the requirements stated above.

It is possible that someday ISRG will have some competition, but there does not seem to be anything on the horizon for now. Furthermore, as the user base expands the barrier to entry increases and the cost of changing systems becomes more challenging.

The most likely scenario for competition would be if another manufacturer were to create a similar system for procedures not yet addressed by ISRG's Di Vinci robotic surgical units. Some of the potential competitors, like Johnson and Johnson (NYSE: JNJ) or Medronic (NYSE: MDT), are actually corporate partners helping to distribute the units world wide. What is most likely from my point of view is that other manufacturers will find a way to partner with ISRG to develop complimentary hardware to expand the capability of the system for more procedures to get to market faster.

Sheldon Liber is the CEO of a small private investment company and the principal for design and research at an architecture & planning firm. He writes the columns Chasing Value and Serious Money.