I like Blender sculpt but......

Sculptris spanks it silly for speed.
3DCoat wins hands down for features and capability..
ZBrush is the standard.
Modo has made significant advances in their sculpting.
Silo, nothing much to say there...all you hear is crickets chirping in the dev area.
Mudbox...ridiculously overpriced like the rest of Autodesk products.

Blender is my preferred software to use however must keep sight of the realities.