Mine was a Wahoo. I had huge problems with my phone's GPS, which would cut out and teleport me across town multiple times in a ride. (Though it worked perfectly on Saturday.)

I really like the Wahoo's GPS navigation and wouldn't want to do long rides without it, now. So, er, *mumble* I bought a new one already.

Wiggle are pretty awesome: I ordered it at about 0030 on Saturday and it arrived 1430 Sunday. Only £5 for next-day courier delivery, and that was covered by the £10 new customer discount.

@Criggie Yeah, Strava's power guesses are pretty random. I love it when it thinks I'm putting out 200W at zero cadence.

It is trying to solve an impossible problem, though. I remember that, when I started wearing proper cyling gear rather than a rain jacket (it was February in England) and gym shorts, Strava thought my power had gone through the roof. Of course, it was just that my power was now going into something Strava can measure (my speed) rather than something it can't (my clothes flapping in the breeze).

Oh, and I think I figured out why I got faster recently: I'm spending much more time on the drops, and I reckon that gives me about an extra 10% speed for the same effort. Which is another thing that Strava's power guesser doesn't know about. And that means that Strava's power numbers probably aren't even comparable from one ride to the next by the same person.

My commute is along the steep slopes. While I ride level Strava often catches segments up the slope that are almost parallel to my route. That leads to ridiculous power estimates.

@gschenk Maybe you underestimate your strength! ;-)