Well you can figure out your avg. W/kg if you know your weight in kg. Pure watts don't mean a whole lot except for max power for sprinting or maybe other small intervals. W/kg gives some more information. And your FTP is probably the most important number for using power as a training tool...which is why I want to be sure I get a better estimate of my FTP this winter training season. I'm just not ready to spend so many hours indoors yet!