Just got in the mail the new M3 and the 2.7v-9v xm-l u2 dropin. Both appear to use the same driver. Beam is clean white with no yellow or green hues.
M3 gave 2.10 amps, 0.85 amps and 0.08 amps with a 3100 mah panasonic 1.82 amps, 0.89 amps and 0.15 amps with 2-3v primarys.
The dropin is single mode only and gives 2.06 amps with the panasonic and 1.55 amps with the 2-3v primarys.