I miss having a powermeter on both bikes. I have a PT Pro on a DT Swiss rim on the Parlee but nothing on the Tarmac. I have a set of SWorks crankarms and am thinking of getting the Quarq spyder PM to get my power data. So who uses one and with what crank and rings? Any issues? I'd be using a Garmin 800 to display and collect the data. Has anyone actually compared the data from both a Powertap hub and the Quarq? I wonder how close they are.