Installed 572 on my 1020, i had not been using a windows phone for over a year, since i was moving to tmobile and waiting for my iphonet o get unlocked, figured i'd try the new builds out on my 1020. I had put an older build on the 1020 way back when the program started for w10 and it was horrible. Figured it would be improved by now.
In terms of navigation and going around the UI, it is much more smoother than the initial build, but taht is expected. What continues to plague this OS with nokia phones which also had the same problems with win 8 with these phones is the constant loading loading loading when opening anything. It just needs to open, each app, i dont care what it is, it needs to just open. Instead, it just loading loading loading, resuming, resuming, resuming. then once you get into the app whatever it is, the laggyness and choppyness is apparent.
Of course these apps are problably not as optimized for the OS, but hopefully they optimize this OS so that i dont keep on seeing resume or loading all the time for everything. This was a problem with the win8 on nokia devices as well.
Teh Battery life isn't very good, in four hours with minimal use, it drained 30 %. I understand this OS is new and in beta, but 30% four hours with less than 10 minutes of use is a bit much.
The app store is so clunky and sluggish, DLs and updates take forever and the apps are very small, yet it hangs up quite a bit.
Some quick observations over the last few days using this, while it could work great with a new device, it definitely not very good to use on some older models. My guess the loading and resuming splash screen is prevalent regardless of the device.