First of all it won't work if you use the gear VR, definitely will distort the image. Second, it's very hard to get a case and screen protector to work. Might have to just use it without a screen protector, oh well. A case is definitely needed for better grip otherwise it'll be difficult to hold with the thin bezels. Just a heads up for everyone.
Bought an Olixar tempered glass screen protector supposedly specifically designed to work with a case. I've used these on all my other devices with no dramas, but this one was awful. Because the adhesive is only on the edges, it leaves a clearly visible adhesive 'sheen' or 'residue' around the edge. It's particularly bad at the bottom. Because it's designed to fit inside the edges of a case, it's quite evident.
It also really badly affected the sensitivity of the touchscreen toward the right hand edge.
I genuinely don't think it's an application issue for me personally. They just don't seem to work very well on curved screens.
Have caved and bought the Samsung own brand cover, even though it's not tempered glass. It will be better than nothing!