Hey guys just seen this post and wanted to confirm a few things in case someone does decide to splash out on smart link. Waze does not work with android auto as yet, nor is it compatable with mirror link or iPhone carplay.
There is however a beta due to be released shortly for android auto for Waze itself as only last month AA had an update which enabled an additional maps app selection screen. But as yet that beta is not live for Waze so I wouldn't hold my breath for it anytime soon.
But Google maps does work exceptionally well on AA and have had no issues with it understanding me through voice commands even with my harsh Scots accent