Overall, Avast One is worse than current Avast at the moment. The UI is nice, but that's it. Though, I would like to have an option for dark theme. I checked out Avast Free Essential, which is the free version.
It's worse because,
1) No protection sensitivity option. I can't increase the sensitivity to high anymore. It doesn't have the option anywhere.
2) Can't tweak scan settings. Like what to scan, scan priority, what to do with detected malware after scanning, etc.
3) geek:area is not present it seems. I can't find a way to check this.
4) Unremovable bloatware includes VPN, Browser cleanup, PC Speedup, Software Updater, Disk cleaner and Driver Updater. There is no way not to remove them. Current Avast lets you choose what you want to install, but Avast One doesn't. Can't remove them afterwards either.
5) The unremovable bloatware like VPN, Cleanup Service and Driver Updater keeps their separate services running in the background.
Why keep them running when I'm not even using them! Disk cleaner and Driver Updater isn't even usable in the free version. Then
why keep these services running for no reason wasting system resources.
6) There also needs to be a dark UI. The new UI is good but too white for my eyes. Dark theme should be an extra option at least.
So, overall a negative impression. It's simply worse than the main Avast at the moment. Don't remove features that users want & love and add things we don't want.