Things to watch out for when your buying content

Poser Dynamics don't work, hair doesn't show up and clothing loads as a static prop.

Poser procedural shaders don't work in DS, as a result most material settings look crap in DS, so you will need to 'adjust' surface settings if the product doesn't come with DS MAT presets.

Smart Morphs, DS hates these and can break the morphs especially if they are Poser PMD morphs.

Poser 8+ rigging, products like Miki 3 will load, but they start to distort when you pose them, as most of the additions to P8 rigging don't load into DS.

Poser 9+ weightmap rigging, avoid as it just doesn't work, some parts do load but you really don't want to go there.

Those covers DS1 to DS3, sadly thanks to the new system they are using in DS4 there are a couple of other things to avoid.

Geometry switching, this is completely broken and will probably remain broken as long as DS4 treats every mess like it treats Genesis.

PMD morphs, DS auto-loads these when they're called in cr2, pp2 & hr2 files, but if the vender didn't 'weld' the mesh before making the morphs and saving them in the PMD, then DS4 will cause the morphs to explode.