I have a Windows Lumia 950 XL. I previously had a Band 2 tracker but i have seen articles saying the Band 2 was going to be discontinued and since i was having issues with my i returned the Band 2 and got the vivoactice HR. There are some features of the Band 2 I like better and others that i like the Vivoactice HR better. The battery life is so much better and the linking to GPS is much quicker with the HR. The HR even stayed locked on GPS when i went inside the grocery store when I tested it which is something the Band 2 would not do. The Garmin Connect app that you have to install on your phone is a lot like the Microsoft Band app for your phone, my big issue with the Garmin Connect app is its lack of a "Snapshot" screen for WALKING like there is for Running and Swimming.
I did have a lot of issues getting the HR paired with my phone in fact I never did get it to. So I went back to the Best Buy store and had the Geek Squad try and it took them a number of try's. Seems the instructions for pairing with a Windows photo that come with the HR aren't 100% correct