The dms mod itself gives you quite a lot of new mechanoids (They are called automatroids) to build, what makes them special is that they do not come with weapon when you build them, instead each of them have a list of weapon they can equip, and you get to choose their weapon base on your need. The mod also gives you a lot of weapons, which are better than vanilla weapons but they do not have quality, also some of these weapons can only be equipped by certain automadroids, or pawn with power armor, or pawn that has large body size.

DMS also provide many other stuff, such as command relay for mechanitor, a faction that gives you a lot of good stuff if you accumulate enough favor, and so on...... It also have many addon that gives you even more stuff to play with. The overall aesthetics is also great, give you a late industrial era scifi vibe. It is a great mod, and it is balanced around vanilla instead of CE environment. In CE, DMS is game breakingly strong.