I just finished my first mod ever a few minutes ago.. It's a shiny purple Mag 3D modified with a 3 watt luxeon TWAK direct driven. I must say, I am very pleased with the mod, all things considered. I disassembled the mag and soldered the positive wire right to the lead and the negative wire to that long strip of metal that goes up the side of the thing, used a hotlips heatsink and dremeled the reflector to proper fit.
Those stock mag reflectors throw the beam of a luxeon 3 farter then anything I've seen so far and anything that I own, with the tightest beam I've ever seen in a luxeon LED. A very nice looking beam when focused with a tight hotspot.. when flood is used, you get the donut shaped beam typical of your mags. The partial melting of a small part of the luxeon itself seems to have no effect on the beam quality when the tight hotspot is used, but is somewhat noticable when it's in "flood" mode.. the melting was on the side near the edge. The beam is so bright, that you really don't need flood mode, because the sidespill is plenty bright anyways... but it's nice to be able to adjust the beam /ubbthreads/images/graemlins/smile.gif
Overall, I'd recommend this mod to anyone who wants a good light at a relatively good price and isn't just using it to shine on walls. It's an excellent general purpose light with great throw.