For me, that was a big reason I was interested in this. While I wouldn't want to do it all the time, the idea of LL/S&S crossovers appeals to me greatly (I pretty much own every SF d20 game/supplement there was)
For the most part it seems pretty close, but I would like to see Agility be Dexterity (I can understand Wisdom being Psionic Potential, but Agility just seems pointless) and 14 levels being standard instead of 12 (since that is traditionally what B/X and thus LL covered). And XP and hit points more in line with those in LL.
Basically I'd like to be able to take a LL/D&D module and run with with S&S characters.
OTOH, since I guess this isn't an OGL product, that might not be possible. But if it's not compatible with LL, then I'm just never going to actually use S&S. I've already got several Star Trek games, what I wanted one that was D&D/LL compatible.