I use the free version, but I also log my miles on my website as a backup. Sometimes my Garmin will have a hiccup, so I'll "lose" miles on Strava, but since I know how many miles that ride is from past rides, I can still log it all on my website.
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my bike page - my journal
Current Stable: Trek Emonda SL - Trek Top Fuel 8 - Scattante XRL - Jamis Dakar Expert - Trek 9700 - AlpineStars Al Mega