It’s clearly lacking in specs, power, and versatility.

The Microsoft Surface Duo is a smartphone I haven’t tested yet—but based on what I do know, it already has me worried. It’s somewhat like the new crop of foldable phones in that it can fold and flip, and it runs Android 10 just like the Galaxy Fold. It also demands a sky-high price like the upcoming Samsung Galaxy Z Fold 2 and Galaxy Z Flip. 

But while folding phones are pushing the boundaries of what a display can do, and charging prices to match, you’re not getting that with the Surface Duo. Instead you’re getting a dual-screened device with giant bezels that’s running a version of Android overlaid with a heavy coating of Windows.
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https://www.pcworld.com/article/3571170/why-the-microsoft-surface-duo-already-worries-me-as-an-android-user.html