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I updated my OP3 to Oreo and it was a bit shit. Ran ok, slightly different colours, but Bluetooth is fucked. Sometimes just refuses to switch on requiring a reboot. Seems this is an Oreo issue rather than an OP specific issue, so I've finally decided to stick Lineage OS on the OP3. Running perfectly so far and although I'd heard the camera was supposed to be shit without the closed-source OP firmware, it's really not so bad (as far as I can tell).
Oneplus 3T has just updated to Oreo. I can't tell the difference from the previous version.