The sheer amount of repetition is surprising. It's not just over long drives, either. I have a 30 minute drive to work and left it set to a "Foo Fighters - Everlong" search for a week. Every day on the drive to and from work the first song played would be Everlong (this is fine, given the search), but at least 2 of the following songs would be repeats from the last time I was in the car. At the end of the week, I realized I wasn't hearing any new songs, just songs I'd heard earlier in the week. If I wanted the exact same playlist every morning I'd just listen to a Top 40 terrestrial station. The lack of diversity is extremely surprising.
Would be pretty excited to abandon it for Spotify.