While I myself see no harm in an upgrade option, I don't like the idea of useless spare parts lying around. You have to figure that once you upgrade to an SST-50/90 light engine module (if that's even possible with the LII), that the old MC-E module would essentially be useless. Sure you could keep it as a spare, but the likeliness of you ever needing or wanting to use it again would be highly unlikely. I would rather a discount be given to those who have already purchased a Legion II instead. If you don't want to own 2 Legion IIs, you could always post the one you got now here at CPFMP as I'm sure someone will buy it at a reasonable loss to yourself (which should be compensated by the discount on the new SST-50/90). That's my thoughts on that...
Come to think of it you are right. Guess my journey in this flashlight world has only just started and all the old timers inputs are really appreciated.
No point having a redundancy engine which might be of less output lying around collecting dust.
So Neo..hope you willing to give discounts on your new projects for current owners who miss out on the new LED upgrade.