Pretty ideal product.
Small, backlit, ez to use. tons of data (including 3s and 30sec rolling avg power and VAM), the data is very readable, it has an excellent mount, does what it is supposed to. Cheap, thanks to trisports.com's 25% off coupon.
No downsides that I can think of, other than having to use a beta version of Download Agent to get the data into WKO+, but I believe you can upload the data to Garminconnect.com and that site will produce a .tcx file that you can drop into WKO+.

Here is the link to Device Agent 3.0: http://support.trainingpeaks.com/device-agent.aspx
It is pretty beta right now and you can't specify where to save the file. When you do save a file, it saves to this directory: My Documents\TrainingPeaks\Device Agent\saved\<whatever name username
you have, default is unkown>
The option to save to WKO+ (red icon) does not work, from what I can tell.