The first two satellites are testing platforms... the system will rely on 30 of these in total and in future receivers are to be made that can work with both the US and EU systems.
With the advancement of atomic clocks and the ability to make them hand held (it can be done, just not at a commerically viable level yet) ...the accuracy of the clocks is one of the things that helps pinpoint your position by comparing your time with that of 3 GPS sats (it can be done with 2 but accuracy is not that good)... and the age of the US fleet and the amount of people wishing to use these systems increasing it is a good thing that the EU chips into the system.
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