Im on El capitan and the latest Safari required to download SILVERLIGHT!!!! Really, SILVERLIGHT I mean welcome to 1999. Anyway, streams are good, better on IOS.
It's a no brainer deal for now, signed up for the 35$ go big, got the free apple tv. took about 15 minutes, but that was 10 minutes of training I did for the sales rep since I was the first in the store.
I already sold the Atv on the bay for BIN 142.5$. Made money and will try the service over the holidays and see if it works for me. Streams on mobile seem to take about 400-425MB per hour, on the lowest setting. Hopefully, they won't actually count towards my ATT unlimited plan.