I have no issue with it. I've used 100% viewfinder cameras and non-100% cameras. I'm happy either way. With the 95%-type, it's kinda nice to have that little bit extra in case you need to rotate the photo a degree or two in post-processing.
If you compose a photo with a 100% viewfinder, and put important image detail at the extreme edges, and you need to rotate, you're out of luck -- some of that important detail WILL be lopped off, or you'll have an off-kilter photo.