I haven't done assembly on mine yet, as I was waiting for more discussions just like this to establish the needs/lack-thereof for pinning.
I have noticed that the frequently mentioned ever-so-slightly porous nature of the resin does seem to be true. It looks like these will really, really, let superglues "tooth in" well (even more-so for epoxies). Given the far lower density of the resin vs. pewter, I'm certainly leaning toward not pinning.
I will agree those that the joints on the Fed saucers, and Klingon cruiser engines are giving me pause. Those are established problem points on the legacy metal minis and lots of us have 20+ years of history dealing with them popping off. It will take some time to adjust to the new material.
As mentioned up-thread, I think surface prep will be just as important on these as on metal. Clean, oil-free, *flat* surfaces will be critical for best strength.
I've noticed the resin ships' dorsal necks will have a tiny bit of "flash" on their upper face. Make sure to file that away so the "pegs" are clear and nothing interferes with their fit-up into the corresponding "holes" in the saucer.
A "jig" would be advisable to help assure that the saucer is being glued on level, both side-to-side and forward-aft. The jig could be as simple as some stacked washers, or more involved and permanent if you intend to do a lot of these ships (I do, so mine will be made using cheap "craft" sticks, like
THIS ONE for my metal Fed cruisers).
On the Klingon cruisers, I've also noticed that they can benefit from some file/sanding work to make sure the engine "wing" and rear hull joint is clean and flat. Any protuberances will cause the engine to not be at the correct angle.