I've used it as a race predictor but not so much for play by play race execution. If it's a flat course I'll target the NP from the BBS output. For a hilly course what I'm mainly looking for is max watts to push on any incline. Using those as general guidelines I've found it to be amazingly accurate.

I would highly recommend using it for a couple of training rides.

When i used it for IMAZ a few years back, (i was using a Garmin 500) it was regularly beeping at me "off course" then "course found" a few moments later

There are also times where it would change power goals after a very short period of time.

Basically, the beeping got old ... fast

Having said that, i was within 10 minutes of my BBS time. A large portion of that was related to rain (which had a lot of people riding really sketchy).

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I do the same thing as them, just slower

I use the cheat sheet that it provides for the course/race one sets up. It is a list of power levels that are appropriate for the terrain/weather (flat- headwind, mod climb -4%, etc.) Having 6 or so numbers to remember is helpful for varied terrain/weather.

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