I was recently in your same shoes and went from .167 to .190. My biggest concern was for the battery life. In my experience so far, there was no change to .190. For me, I did not see a difference in battery life and will be downgrading to the .185 to see how that works. The only thing that I noticed from my use between the two were thumbnails. When I went to .190, the images no longer displayed. I didn't lose the images, but they were displayed with a thumbnail icon vs. the actual thumbnail of the image.
The process to upgrade/downgrade is an easy one, you just have to have the time. If you can't complain with the .167, then my suggestion would be to hang with it.
Just my 0.02.
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