I prefer WinPFGW to PRP/LLR. I know it is slightly slower (a couple %), but the GUI is more intuitive than PRP/LLR and the output is not as verbose, meaning that all you need to do is maximize the application from the tool bar and you immediately see if a prime was found. I think (but I haven't d/l'd the recent release) that the toolbartext for the WinPFGW will show you the number of primes found since it started so you don't even have to maximize the application.
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