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Read a solid review on XDA, and 2 5-star reviews on Amazon. Ordered it this evening.
Sony Xperia X Compact Screen Protector, TopAce Premium Quality Tempered Glass 0.3mm [3D Curve Fit] Full Cover Screen Protector for Sony Xperia X Compact (Black) [link]
It's a wonderful sub 5" phone. The Nougat update seems to have corrected some of the XC's issues regarding camera and speaker audio. As you may already know, the fingerprint scanner is fully functional with a simple flash to UK firmware. It's also waterproof. Actually waterproof. It is marketed as IP68 certified in Japan.
For accessories, I recommend a curved glass screen protector and a skin or case to protect the back, because the XC is made out of very scratchable plastic. Also consider getting a Quick Charger, because the XC is FastCharge3.0-capable, but Sony does not include one with the phone.