My Dillenger battery came with DLG branded NCM 18650-260 cells. They are not LG or Samsung... but DLG is pretty well respected in the battery cell business. I've been inside my battery because I shorted my charger input and had to replace it (easy task). Everything in there was well laid out and not slapped together with cheap cells, wiring etc. The BMS was well located and protected but it didn't have much to identify it on the side that was visible, so I don't know much about it.
From the way some folks talk about kit batteries I was worried I'd find a real mess in there - but on the contrary it was very professionally constructed.