Although we don't believe in timing the market or panicking over market movements, we do like to keep an eye on big changes -- just in case they're material to our investing thesis.

What: Shares of iRobot (NASDAQ:IRBT), a developer and marketer of robots for the defense and security industry, as well as home robots for consumers, short-circuited and fell as much as 10% after the company reported its first-quarter results after the closing bell last night.

So what: For the quarter, iRobot delivered revenue growth of 7.5% to $114.2 million, but saw its net income slide to $5.3 million, or $0.18 per share, from $8.4 million, or $0.29 per share. EBITDA also declined by $1 million to $14.2 million from the year-ago quarter. Still, this was good enough to top Wall Street's expectations by $0.02 per share. Looking ahead, iRobot is forecasting $138 million-$145 million in revenue for the second quarter with EPS of $0.15-$0.25, and $560 million-$570 million in revenue with $1-$1.15 in EPS for the full year. Although both the second-quarter and full-year ranges are in line with the Street's expectations, the midpoint of iRobot's guidance is a tad lower than current consensus estimates, which appears to be today's source of weakness.

Now what: This is a tough call for investors because shares appear to be getting unfairly beaten for decent top-line growth during the quarter and guidance that fell within the range of the Street's expectations. In fact, research firm Needham came out defending iRobot today following its results, reiterating its "buy" rating on the company. However, we're also talking about a company valued at a pricey 26 times forward earnings even after today's tumble. Keep in mind that iRobot is exposed to consumers' ever-changing buying habits, and there's always uncertainty surrounding government spending. As such, while I do see the downward move as perhaps excessive given the news, I'm in no rush to suggest that shares are a good value for investors yet.

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Sean Williams has no material interest in any companies mentioned in this article. You can follow him on CAPS under the screen name TMFUltraLong, track every pick he makes under the screen name TrackUltraLong, and check him out on Twitter, where he goes by the handle @TMFUltraLong.

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