I didn't, but I'm playing the Argentine league (first 2 seasons with Velez, then a little time in Colombia and now manager of Boca, all I can say is that he is awesome for River (his goals+assists is equal to the number of matches he plays) and when I play them he mostly is a pain in the ass.
Cavenaghi is the best striker I have ever signed. I have him, Rooney, and Reyes in the same squad and Cavenaghi is by far the best of them. He's faster, stronger, and finishes better than Tevez, plus he's tall and gets his head to every ball. Cavenaghi is probably the best player I have ever had.