The Timeline Slicer custom visual works quite well. However it is currently pretty much unusable due to its massive space requirements. At the moment one third of the vertical space on my report is taken up with the Timeline Slicer.
I don't know if anyone from the MS custom visuals team is here, but you need to run it past a usability expert. I am unable to leave a review in the store, so here is my feedback.
The problems are:
Solved! Go to Solution.
All of requested improvements are in our backlog.
We'll update this topic once we finish some of improvements.
Microsoft Power BI Custom Visuals
+1 on getting the amount of page real estate used improved for this extremely useful slicer.