SIRI) operates two satellite radio systems offering music, sports, entertainment and news on a subscription basis. Available in vehicles, radios, smartphones and on the Internet, subscribers can chose from a variety of package starting under $20. Sirius' first-quarter revenue rose 9% to $723.8 million from a year earlier. Net income increased to $78 million from $42 million. At the end of the quarter, the company's cash and cash equivalents stood at $433.7 million, up 62%. New subscriptions totaled 373,000, bringing the total to 20.6 million. The company reaffirmed its 2011 guidance with revenue estimated at $3 billion and adjusted EBITDA at $715 million. Meanwhile, Sirius raised free cash flow estimates to $350 million from $300 million. With regard to subscribers, the company forecasts a net addition of 1.4 million this year. Of 13 analysts covering the stock, 46% give it a buy, while 46% rate it hold. On May 8, analysts at Maxim Group assigned a buy rating to the stock and raised its price target to $2.5 from $2.2 a week earlier. This indicates a 6.4% potential upside from current levels.