I install mine more upright when I use it, but I'm not terribly comfortable with it. It's why I no longer recommend that seat. When the new dual-line indicators finally become available here in the US (they're already out in Canada), it should be back on my "nice" list. In the meantime, I'm using a RA55 instead. I had to send my CA65 back to Dorel for unrelated issues, but my replacement is backordered. When it gets here, if the replacement doesn't have dual-line indicators then I'm going to have to think long and hard about whether to keep it or sell it and buy a Radian when DD gets too tall for the RA55. A Radian didn't used to be an option in that seating position, but now that the angle adjuster is available that's changed.
They have said that the seat passes crash tests more upright. They have also insisted that the instructions need to be followed, and if they can't be followed the seat should be turned FF or a different seat should be selected. Different people read different things into those statements and make different choices about it.