It's the exact same phone when it launched. The whole antennagate was majorly overblown. The 3G and 3GS, Nexus One, etc all exhibited signal drops when the antenna was covered and in an area where the signal isn't the greatest which can cause the bars to go down because when the db dropped, it went into the 3-4 bar range. At my house, it drops low enough to cause it to go to 3-4 bars. But at Nationals Park, the db's are still within the range of 5 bars.
In real usage for me, I never had a problem with it as I don't bear hug the phone when I hold it to talk.