I had the chance to use the HTC Vive for around 10 minutes and the only problem I had was that my arms got tired because of the game :P Either you eyes are too sensitive, or those Samsung VR headsets are garbage (which wouldn't surprise me, considering how cheap they are in comparison).
I don't think my eyes are sensitive (I really don't know). I basically had to look with by eyes crossed to see anything, so that could be why. And plus, you never know if those things might go BOOM! ;)