Add the option to display S.M.A.R.T. data for the drives, accessible to the Admin in the Drives section of the Web UI.
S.M.A.R.T. data is the only way I know of to see if a drive is healthy, or about to fail.
I feel blind without it.
LOGs in WebUI
Suggestion for the LS421DE:
I wish there was a log, where configuration changes, user logins and important events are logged.
This log should be accessible to an Admin in the Web UI.
Today my new LS421DE had been online about 7 days, and suddenly it could not be accessed.
The shares could not be browsed, and the web UI did not show up. Checking in my router, the LS421DE was not online.
When I checked the physical unit the power was on, and the drives spinning.
The only thing I could do was use the power button on the back to turn it off and then on again, and I now have no info on what went wrong.
I believe a log would benefit troubleshooting.
There is also security benefits to have logs for a NAS used by more than one person.