I have an XA, bought as a spare while my Z1 Compact was in for repair.

The XA has a number of fatal flaws.

1) There isn't enough storage left from the 16GB after you've updated the built in Android apps. It's terrible.

2) Sony disabled the feature in Android 7 where you can adopt your SD card as storage. They also removed the feature from Android 5/6 which let you move apps to your SD card in bulk.

3) It uses a MediaTek chipset which eats battery (The XA's battery isn't large) and it isn't on the Open Device Program, which only has Qualcomm chipsets.

They've just released a new XA1 which comes with 32GB storage so that'll fix some of the issues surrounding storage.

The X Compact is ok but for me it fails at being a true Sony Compact in that they use a slower CPU than the bigger phones and they also dropped the waterproof capability. The slower CPU is passable but I use my phone in the rain on my bike's handlebars.

And that's why I'm back with my Z1 Compact.

IMHO The last decent phone they did was the Z3 Compact but they're not updating that with Android 7.