I know you will read a lot here about bad Firmware updates, but I've got 2 P3s and have updated each time it was offered, no hiccups or issues whatsoever. Just read thru the process, and don't try to rush it. If you have issues, ask.
That said, DJI does tend to "tighten the leash" by removing/editing features, with no warning. I'm sure it makes things safer from their perspective, but you can lose customers faith if you are not upfront about these things. Best not to be first, the next update might be something simple that really has a negative effect of the way you like to fly.
I've never had an issue with updates to my p3p aircraft it's self...but my last controller update was a disaster..I downgraded... and the last dji app without google maps sucked so I down graded that as well. I think I'm just gonna stay put for now. The 1.9 firmware did have an update for the battery for cold weather conditions which might come in handy