I have the 950*XL.
But in general I would not personally recommend fast or slow ring.
Battery life has always been bad for me but how after just 10 minutes of wifi on and edge, the phone is very hot and battery drain 30-57% per hour.
Crashes in apps.
Main apps have to be installed again.
Freezes for few seconds.
Best to wait at least till March, as*at that stage they will really try to fix v everything for release in April.
But if you really like new features and don't mind some problems, slow ring has better builds generally.