I've no idea of the quantities but they made three different versions, the original ones had the finger grooves like the P2X and was available in single mode tactical and the dual mode Low/High. Then they brought out the same mode options in the later body, which had returned to knurling instead of the finger grooves. The last version was the knurled body but with Intellibeam, which I recall being sold off at discounted prices about 4 years ago or so.
I've never had one of the P3X models but I seem to recall folk had issues with the LED burning out, they were 1000 lumens compared to the P2X of 600 in the same size of head.
If there were no overheating issues then it would have been sensible for Surefire to release it with a High/Low and bored it for dual fuel, which would have made a good duty light.