I heard Voronin was recommended to Benitez by his scout network who obviously see him as a catch on free transfer. Supposedly works hard and can be versatile. Obviously, he's not a major signing but a free transfer for him isn't the worst deal in the world. If Rafa likes him, then we should give him a chance
The only drawback for me is that Voronin's arrival will most certainly mean the exit for Robbie