Depends on what you intend to do with them. If you want them to see where your drone is at night, then they work well for that. Put one facing forward on full on, and the other backwards on strobe mode and you can figure it out.
To light up something for still shots from the drone you have to be close, maybe less than 15 feet unless you raise the ISO a lot and deal with the noise in the blacks. Honestly, LEDs are not that bright against a studio or flash unit in my experience.
You'll have to take them off the bird as they do stick out a bit on each side to put them in a case even with their brackets. They have to be plugged in to a USB type charge for a couple of hours too so I bought one of those ban 2 amp chargers rather than use one US cable and spend 4 hours charging two of them. Run time at full brightness is about 23 minutes or one flight. They are purplish in color too and not daylight and I see they came out with some CTO filters to address that, but the holder is magnetic and heavy too, and could that bother the compass? I don't know.
The cost is your decision, but reality for me is I do not use them that much as I wanted them for aerial stills and they don't cut it for me. It's also a narrow beam with a lot of vignetting with a wide-angle drone lens.
Sorry, I don't know what the difference between the P3 legs are.
