I am using @jason0x43 's excellent App and Drivers...used to have reliability issues until Jason totally devoted a huge chunk of his time to help get the port switching resolved. His GitHub is at GitHub - jason0x43/hubitat: Hubitat apps and drivers and there's a discussion page here Wemo switch and insight smart plug
I really don't have any issues w the WEMO's other than this overall Hubitat to Device sync issue.
