No I have not. I did a wikapedia search http://en.wikipedia.org/wiki/Globalstar
From the site.....
According to documents filed with the SEC on January 30, 2007, Globalstar's previously identified problems with its S-band amplifiers used on its satellites for two-way communications are occurring at a rate faster than previously believed, possibly eventually leading to total loss of service in 2008.
In the filing, Globalstar made the following statements:
"Based on data recently collected from satellite operations, the Company has concluded that the degradation of the amplifiers is now occurring at a rate that is faster than previously experienced and faster than the Company had previously anticipated."
Industry analysts speculate the problem is caused by radiation exposure the satellites receive when they pass through the South Atlantic Anomaly in their 876 mile (1414 km) altitude orbits.
"Based on its most recent analysis, the Company now believes that, if the degradation of the S-band antenna amplifiers continues at the current rate or further accelerates, and if the Company is unsuccessful in developing additional technical solutions, the quality of two-way communications services will decline, and by some time in 2008 substantially all of the Company’s currently in-orbit satellites will cease to be able to support two-way communications services." 
"The S-band antenna amplifier degradation does not affect adversely the Company’s one-way “Simplex” data transmission services, which utilize only the L-band uplink from a subscriber’s “Simplex” terminal to the satellites. " 
"The Company is working on plans, including new products and services and pricing programs, and exploring the feasibility of accelerating procurement and launch of its second-generation satellite constellation, to attempt to reduce the effects of this problem upon its customers and operations. The Company will be able to forecast the duration of service coverage at any particular location in its service area and intends to make this information available without charge to its service providers, including its wholly owned operating subsidiaries, so that they may work with their subscribers to reduce the impact of the degradation in service quality in their respective service areas. The Company is also reviewing its business plan in light of these developments. " 
 Globalstar's Interim Solution
"The Company’s liquidity remains strong. At December 31, 2006, in addition to its credit agreement, the Company had unrestricted cash on hand and undrawn amounts under the Thermo Funding Company irrevocable standby stock purchase agreement of approximately $195 million." 
On 18 April 2007 Globalstar announced they would launch eight spare satellites to augment the company’s existing first-generation LEO satellite constellation. On 29 May 2007 the first four of these satellites were launched by Starsem from the Baikonur Cosmodrome in Kazakhstan atop a Soyuz-FG/Fregat rocket. The second launch, also aboard a Soyuz-FG/Fregat from Baikonur, was launched on 2007-10-20.
However, it is still not clear when the new satellites will improve phone communications. The Globalstar website is mute on this issue. Most current users in summer 2007 report difficulty using the phones, with very short communication windows of 1–2 minutes and frequently dropped calls. In addition, an offshore fishing magazine (Big Game Fishing Journal) wrote an editorial in their July 2007 issue on the poor service of Globalstar .
I would steer clear personally.