Mine works fine. Dont regularly check how many sat's its hitting, but as long as the com port is set up in iguidance right (sometimes looses the com port on hibernate) it works great. In short, if it works at all (which it does most of the time) it works great, no loosing signal.
Where do you have it mounted (facing up, preferably mounted on a metal surface, with no metal beween it and the sky)? Where are you driving (city, tall buildings, mountains)?