ISRG Earnings Report?

Do you have any ISRG stock news?
Intuitive Surgical (ISRG) is still holding back from issuing full sales guidance for 2009.
While it posted better-than-expected results in the third quarter, its shares took a dive in after-hours trading after the company said it wouldn't give full sales guidance. This is the third consecutive quarter the company has refrained from fuller financial forecasts.
Why is it that they refuse to do it?

Also, ISRG today reported its third quarter Earnings Report. What do you think, should I buy more?

The company did upgrade its forecast for procedures done with the "da Vinci" robots this year--based on results thus far, the company is on target to see procedures rise more than 47% from a year ago, said Benjamin Gong, vice president of finance. The company in July boosted its forecast to 45% procedure growth.

Intuitive Surgical Inc. (ISRG) posted a 12% increase in third-quarter earnings, boosted by higher revenue and a gain from deferred revenue, more than offsetting lower margins.

The weak economic environment for selling expensive capital equipment to hospitals, including the popular, but pricey da vinci, has been somewhat of a challenge.

The company sold 86 machines in the quarter, down from 91 the prior year but above the 76 sold in the second quarter. Of the systems sold this quarter, 70 were the newer, more expensive DV Si model.