Still wondering about the right balance of prerequisites wrt. shard guns, gauss tech and sonic weapons. Shard guns require a commander (incl. naga lord) so you essentially need to do a very large ship to get it. Gauss requires a navigator, which you might get from a large or very large ufo. Sonic requires alien implants (and some delay because you need the bionic lab), which you get from a very large ufo. It seems you get these very close together; now researching sonic in October and I just obtained gauss and shard a month or so ago. While these are not mutually exclusive (I especially like gauss sniper rifles), would it make sense to space them out a bit more. For example, make the relatively weak shard weapons available upon researching a squad leader or a paladin? It would make sense that upon interrogating someone using the weapons you would learn how to use them because shard guns don't require a biological connection.
Another balancing thing I noticed that I have only obtained one (1) M.C. reader in the game so far in October. Or maybe some of them were destroyed in gas cannon HE/ZR explosions. I think these should come up more frequently, to make it easier to identify which aliens you need to capture.