I had three DX P7 before my MG P Rocket SST 50. I had problem with the P7 light dimming on me when I hit a bump. I took those apart at the switch and they were fix but the problems eventually return.

The MG P Rocket is slightly brighter at close range with the P7 having a wider throw. At a distant of 30+ ft, the SST 50 is brighter. I also tried using the better AW 18650 battery in the P7 to see if it will be brighter but it did not make a difference. The MG P Rocket body is smaller and feel more solid when mounted on my helmet with the Twofish.

I notice the model I got from shining beam is no longer sold. It was listed at 800+ lumen and a more white color output. The one they have now is the 700+ lumen at less white color, however from what I gather, most customer don't notice the difference. The price is almost double of a P7. Probably not worth replacing a P7 unless your P7 died or having problems.