I have 2 of the units and both are working fine knock on wood. That said, I noticed that the case around both units felt very warm to the touch. I decided that the display was the source of this apparent overheating
Permit me to point out to you that your views on your M1001s have been inappropriately posted in a Forum and thread that refers to the R1000 radio, where it is a known fact that the PSU problems are not
related to display-brightness.
Roku state that the purpose of this SoundBridge Radio General Discussion Forum
is to "Discuss SoundBridge Radio-specific issues here. For generic SoundBridge discussion, please use the SoundBridge General Discussion forum"
As regards the OEM wall-warts
for the M1001s, these run at ridiculously hot temperatures (even when the M1001's display is in low-brightness or standby mode). You can read informed comment on these OEM wall-warts
by use of the Search button.