Interestingly, Boonen's Tarmac SL4 didn't have a powermeter:
http://www.bikeradar.com/road/gear/a...mac-sl4-33549/
I wonder if his Roubaix for today was also without a PM, and he just rode the entire 50km right on the knife's edge just based on PE/feel? I know an experienced rider like him is capable of doing so, but seems strange to NOT use a powermeter and remove even the slight margin of error.