Superficially this app looks good and useful. It connects to my VR2100 router and allows me to change some settings. However, I found that when the router was doing a large upload of files from my PC (connected by LAN cable) the VR2100 maxed out and did not talk correctly to the Tether app. The app said "no internet" and told me the VR2100 was offline without internet, but this was a lie the files were uploading. The router was unable to declare that data was flowing so the app was misleading.