I have a one+ it's the 5T model which was the last before they changed to the one+6.
I brought it outright through Kogan for somewhere between $650 - $800, including a hard cover. I can't remember the exact price, but at the time I was looking to upgrade my Nexus 6 and a Pixel 2L was out of my budget at the time.
I like the vanilla android devices and even though one+ use their own OS, you wouldn't notice the difference between it and a pixel/nexus os, unlike a Samsung or Huawei (not that is an issue anymore).
At the time I had heard of one+ devices, but not had anything to do with them. I had also not heard anything bad about them. They have their own user community where there are areas much like this forum for help, sharing pictures taken, programming and competitions. It's actually really cool.
Anyway, back to the phone..
The 5T has dual Sim, with slot two also able to be used for expanded storage, dual lense camera which is amazingly good, the screen isn't lastest tech - but you wouldn't know because it is clear and has a range of adjustability for different scenarios, finger print scanner that is faster than the pixel one, has a little slider switch to change from ring-vibrate-silence handy for changing while in your pocket, 64g memory and I think 4g ram. USB C charging/download. The down side to this model is it has one speaker at the bottom of the phone and it isn't IP67 or 68. Not that I generally care about either two issues.
Plus all the other crap they list in the phone features.
I haven't had a issue with this phone, which to me is odd as usually I have had phones freeze up randomly or get slow when you are doing multiple things. I rate it and are considering using to the latest model when this ones service life comes to an end next May/June, rather going back to a Pixel.
Worth having a look anyway.

