Very tempted now that I have no need of the dual SIM feature in my OnePlus 2.
It's a great phone so far, especially for the price and the opportunity to run sailfishOS.
Do make sure you read up before unlocking the bootloader if you plan to do that. There's a partition with DRM keys (I know, terrible...) that needs to be backed up if you ever want to re-lock the bootloader and have the stock rom work properly. Sony provides the unlock, so I'm not sure why they have it setup this way. Especially since they seem to want to cater to the tinkering crowd, as they provide an app to flash other ROMs as well as a standard recovery app. If you get the phone, don't get the American version, or if you do, flash the U.K. stock ROM (bootloader unlock not required). This allows you to use the fingerprint sensor (disabled in the American version due to patent conflict) and you can install the Concept app from Sony which lets you get the most recent builds from their dev team. I think the only phone with slightly newer stuff is the Nexus/Pixel phones. But I'm on 7.1.1 right now and it works really well.