For those of you waiting for Android 6.0 Marshmallow with root for your OnePlus One, I have a great recommendation that you can use as daily driver, the VM13 ROM.
Built by Team Nocturnal, the VM13 ROM brings you pure Android 6.0 Marshmallow with nearly flawless experience. You will find the same exact experience you would find on the new Nexus 6P right on your OnePlus One.
I have tried several other Android 6.0 Marshmallow ROMs but found they were very buggy (such as random reboots) but the VM13 ROM runs fast, no reboots, and seems to run flawless in my 48 hour of daily driving.
The camera is a bit buggy but I found still camera works fine if you use the default AOSP camera and use Google Camera for video recording. You may find some force closing of the camera app but it only happens after you take the photo.
Other than that, this is probably the best it gets for right now but I will definitely have an update soon when there’s even better Marshmallow ROMs out for the OnePlus One. So definitely give this ROM a go this week(end) and do let me know what you think!