Picked up a Half Jacket 2.0 not long ago, and they are really growing on me. So, I'm toying with the notion of getting a Half-X. I'm curious as to how they relate to in size. Are they bigger, smaller, same size as the Half Jacket 2.0? If they are bigger than the Half Jacket 2.0, I probably won't be interested. I'm hoping the Half-X is the same as the Half Jacket 2.0 but just in a metal frame. I always stayed away from models that had the actual lens exposed or not completely surrounded by the frame. I would also like to know if replacement lenses for the Half-X are strictly for the Half-X...or, could I use Half Jacket lenses on the Half-X? If so...would they have to be from a Half Jacket 1.0, 2.0, XL, XLJ? Thanks in advance! Would sure like a Half Jacket in a METAL frame with standard 2.0 size lenses (not XL or XLJ).