Based on the aggregated intelligence of 180,000-plus investors participating in Motley Fool CAPS, the Fool's free investing community, the SPDR S&P Biotech ETF (NYSE: XBI) has earned a coveted five-star ranking.

With that in mind, let's take a closer look at SPDR S&P Biotech and see what CAPS investors are saying about the ETF right now.

SPDR S&P Biotech facts

Inception January 2006
Total Assets $389 million
Investment Approach Seeks to replicate the S&P Biotechnology Select Industry Index, which is derived from the biotechnology segment of a U.S. total market composite index.
Expense Ratio 0.35%
1-Year / 3-Year / 5-Year Return 0.2% / 6.5% / 5.7%
Top Holdings with High CAPS Rating (4 or 5 Stars) and Portfolio Weight Amgen (Nasdaq: AMGN) (3.3%)
Myriad Genetics (Nasdaq: MYGN) (3.3%)
Celgene (Nasdaq: CELG) (3.2%)
Alternatives iShares Nasdaq Biotechnology (Nasdaq: IBB)

Sources: Morningstar and Motley Fool CAPS.

On CAPS, 98% of the 128 members who have rated SPDR S&P Biotech believe the ETF will outperform the S&P 500 going forward. These bulls include All-Star lemus, who is ranked in the top 10% of our community, and iddqkfyou.

Earlier this year, lemus summed up the opportunity: "If you can't decide on one, buy a basket of them. Like [SPDR S&P Biotech] slightly more than [iShares Nasdaq Biotechnology], smaller cap biotechs with a more concentrated portfolio."

In fact, SPDR S&P Biotech sports a portfolio whose stocks average long-term earnings growth of 19%. That's higher than that of other biotech ETFs like iShares Nasdaq Biotechnology (14%) and Biotech HOLDRS (10%).

CAPS member iddqkfyou expands on the outperform argument:

Some of these companies will go up 10x and some will go to zero... But I like those odds because I believe that the time is finally right. This industry has broken away from a linear progression, so I want to place some chips to see where they land.

What do you think about SPDR S&P Biotech, or any other ETF for that matter? If you want to retire rich, you need to put together the best portfolio you can. Owning exceptional ETFs is a surefire way to secure your financial future, and on Motley Fool CAPS, thousands of investors are working every day to find them. CAPS is 100% free, so get started!

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This article represents the opinion of the writer, who may disagree with the “official” recommendation position of a Motley Fool premium advisory service. We’re motley! Questioning an investing thesis -- even one of our own -- helps us all think critically about investing and make decisions that help us become smarter, happier, and richer.