3 stars: I very much want this to be great but my frustration with it has peaked. Scott Lesher's review sums up my experience, so I'll just direct you to his review. Sadly, I've disconnected it and will wait for improvements.
5 stars: Love it. Works great with my Galaxy S8+.
3 stars: App is ok and here are some pros and cons. PROS: Love that i can use my steering wheel to change the tracks. Telling Alexa to call someone is great as well. Now i can listen to 90's musix when i want CONS: Connection to the device in my car is spotty. Sometimes it connects instantly, and others it takes a while. Also, the voice recogniton is not all there. The Echos have 7 mics. How many does the Muse have? Considering road noise, ac and heat vent sounds, i have to yell at times. Last is tje delay when sahing Alexa. It takes a few extra seconds to understand what was said and then to actually say it. Forgot to add one last thing. Why when my phone disconnects from my car, the app is still running? Jusf now as i kay on the couch using my phone, the Muse app just popped up outta nowhere and says "tap for alexa". Shouldnt the app open and close when connecting and disconnecring to muse and BT?.............. UPDATE: with the latest update, there is still no difference. I need to open the app when i get in my car. Yesterday as i was using Alexa, i needed to lower the volume of the radio and the heater for Alexa to hear me. Kind of an annoyance especially if one is to use Alexa constantly...