Recently I bought a Garmin Edge 510 to use for tracking my cycling. Prior to this I used my Garmin 610 which had a training effect feature.
I actually ride with both the 510 and 610 using the 610 as a backup recording device. I love the way that the 510 auto uploads my ride via my phone, however I would like to be able to add the training effect score that the 610 calculates. This allows me to use the Activity list screen and quickly compare effort on rides without drilling in.
Being able to manually edit the Training Effect field would also be useful to rate the ride even if the user doesn't have a TE compatible device.