It's nice to have but the smartphone app (on iPhone) is too poorly written to use. It is VERY slow... it after a few weeks, it eventually kicks you out so you have to re-enter your name and password. What is the point of fingerprint access if the app forces you to reenter name and password? My banking app uses fingerprint access and it NEVER kicks me out forcing me to reenter name and password. This may sound like a small matter, but if you are like me you have LOTS of names and passwords all over the place. It is virtually impossible to remember them all, which is why fingerprint access is so useful. For a while I could not remember name and password for the Mercedes app so I stopped using it. One day I tried a few combinations and got access again.
I like the ability to "locate vehicle." I have never had to use this feature but it gives me peace of mind should the GLE ever be stolen. I also like the ability to lock and unlock via smartphone. A few times I have used the Send2Benz feature and it works well, but again the entire app is way too slow when compared to any other app on my phone. I have never used the Remote Start feature, but if it works as advertised that could be useful at some point.
If the app were faster it would be useful.