So I have been using this mod for a good bit. First off, I must say I do enjoy them to an extent. They are balanced above other weapons as stated clearly in the OP. Not exactly a problem, but I do have 2 minor gripes about the mod. One more so than the other.
First one being, in my opinion, you shouldn't be able to just buy them at the prism freeport. Shouldn't even be an option. Save up enough money at the start, and some of these weapons can literally define your playthrough if you let it. No challenge in getting it, but rather just given to you because you saved up.
Second one is about a particular weapon. The Cluster Torpedo. I get the idea behind it, and it is a neat weapon to use. Holy f-ck though. Why? I literally annihilate an entire star fortress with a single hit. Sacrifices not considered, that is outright insane. Just field 1 or 2 gryphons with a heavy escort to get it/them in range and all of the sudden it's a dead fleet. One large Missile mount and you can tear through any fleet that's foolish enough to group up and looks at you funny.
That said, I do enjoy the weapons overall. They generally function different as compared to vanilla or even other modded weapons. Not entirely sure about the names of them, since one is a little redundant(the EM railgun, even though railguns are already electromagnetic...?). Hopefully more can be added, or different types. A melee weapon might be somewhat interesting, I think. Making ramming more fun. Still a fun mod anyway though.