Today is the first day you can order your own Apple Watch, which will ship on April 24. But do you want one? After all, it’s not clear yet what the Apple Watch can do, other than tell time, provide notifications, share heartbeats, and track some activity metrics. And early reviews are not exactly glowing, which is unusual given Apple’s habit of seeding many of the first wave of review units to “friendly” reviewers.

The Apple Watch is by no means the first smartwatch; the Pebble was the first modern smartwatch, and Android versions have been out for more than a year. Neither platform has gotten much uptake, but they provide lessons for what the Apple Watch should do better and offer guidance as to whether you’d even want an Apple Watch.

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