I know i'm a bit late on contributing to this thread, but i can offer some info:
i have 2 of the DX true 30mW and 1 of the not-true 50mW. the true 30's are MUCH brighter and have MUCH more reliable output levels. i'm sure that there is a huge amount of variation, so my experiences might not apply to all, but i recommend the true 30 for sure