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: We have time for just one more "pop" before we stop for the weekend. And that's grand news for shareholders of equipment-rental company RSC Holdings (NYSE: RRR), recipient of a tidy 11.5% increase in share price Friday.

So what: No mystery as to the cause here: RSC reported Q2 results Thursday evening, and the news was good: revenues up 22%, and last year's Q2 loss averted. Why, RSC even booked a tiny profit this time around -- $67,000, or, as management modestly described it, "$0.00 per diluted share."

Now what: RSC tells us that non-construction and industrial demand for its equipment is on the upswing, while non-residential construction, albeit on the decline, is falling only "moderately." Management's not making any promises about how these trends will play out on its bottom line, but the analysts who follow RSC think the company will earn enough this year to place a multiple of 17 on today's stock price.

From my perspective, this price looks a bit rich. These same analysts expect RSC to grow its earnings at only about 12% per year over the next five years, after all. Meanwhile, free cash flow at the firm remains stubbornly negative. My advice: If you got some gains out of RSC Friday, harvest them. I'm pretty sure you can find a better opportunity to put your money to work elsewhere, and you don't even have to look very far to do so.

So who's right? Rich, or the investors who bought RSC in droves today? Add the stock to your Watchlist and find out.

Fool contributor Rich Smith holds no position in any company mentioned. holdings and a short bio. Try any of our Foolish newsletter services free for 30 days. We Fools don't all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.