I model almost exclusively in CINEMA 4D I find it one of the easiest interfaces to deal with, and its got one of the best collections of modeling tools on the market that I have found. I dabble in Modo and ZBrush, but don't tend to use them for finished work. I guess now I will have to give Hexagon a shot. ;) It does look to have some useful stuff. I also have lightwave 8 and Silo, but neither ever clicked for me.