Do you have a Samsung phone?
I had the original Samsung Gear watch and it worked nicely with my Samsung Galaxy Mega 6.3...but when I went for an LG G3 as my next phone it didn't work without a major work-around (My watch has stayed in a drawer since).
I now have an S6 Edge Plus and I've thought about the new Gear...but the cost of the new one has put me off.