What did you notice the most when going from the iPad4 to the 2018 iPadPro?
There's no 2018 iPad Pro yet...
I have both 2016 Pro 9.7 and 2017 Pro 12.9, though. Performance was greatly improved. The display upgrade was pretty nice. Speakers but I typically use headphones anyway. Also, fewer Safari tab reloads and out of memory crashes. Even now, I have no speed complaints with the Pro 9.7 (or really, any device with A8X/A9 or higher). Alas, battery wasn't as good as iPad 4.
I actually went from 128GB iPad 4 to 16GB Air (original). Size and weight were greatly improved. I had originally wanted a 128GB mini 2 but I was traveling overseas and the mini 2 wouldn't have made it for the flight. Got the 16GB thinking I'd replace it when I got back to the US but ended up keeping it. The 16GB storage though, was an absolute exercise in frustration. Really, by the time 2013 rolled around, 32GB should have been base storage considering retina display and how huge apps have gotten. Couldn't even do OTA update to iOS 8 (needed 5GB free?) without nearly emptying it.
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Many people don't seem to put the prices of these devices into perspective, considering their true worth and what else could be bought for these not insignificant amounts of money.
Nah. I know what can be bought with it (heck, AAPL shares for one, BRK.B, VOO or VTI if one wants an pre-diversified stock/ETF holding). I just consider the utility and enjoyment derived from the iPad to outweigh other things those funds could've gotten me.
For my personal computing needs, the iPad makes up 90% of my usage so it certainly earns its keep better than, say, my iPhone.