Yes, I definitely think the new sculpts are worth it! They go together pretty well and a lot of the bits are interchangable outside of the actual poses of the legs and torso. You have to be careful because when you put the legs together, might take multiple tries to get right and any glue smudge can melt those raised ridges on that area. The poses are kind of not too customizable, but they all look good and especially the Exarchs. Details are great, from the belts to the filigree to the runes on the chainswords.
I say they are definitely worth the cost over all!