Yeah, it's pretty frustrating that they are ignoring the WP8 user base for some reason. It's now going on 6 months since they released this crappy app with not one single update since then. They managed, however, to get the BlackBerry version ported over - sigh.
Before I gained some sense and switched to Windows Phone from Android, I was a paid user of Slacker. In fact, the availability of the Slacker app on WP8 was one of the reasons it made it a bit easier for me to switch because I got a lot of use out of it. Then I found out that they could pretty much care less about Windows Phone users (as evidenced by their 6 month update shun when, at the same time, they blitzed every other platform with their new app redesign). The very worst about it isn't just from a design standpoint. It's also from a functionality standpoint. The features you PAY for are NOT available in this half-assed, buggy, "current" version of the WP8 Slacker app. No Playlists, no downloading offline content, etc..). I cancelled my subscription with them a few months ago and left them a somewhat scathing review on the Windows App Store (not that they seem to be listening anyway).
Gee - thanks so much Slacker.