.lenconWhat's the difference between I/o and I/o x?
I am unsure exactly, but I noticed a strap difference. On the I/O, where the strap meets the frame, it has a wider surface area. On the I/O X, however, it meets at a smaller clip instead of the entire end of the strap being attached to the frame. If I knew how to embed pictures I would show you, but I just googled them and checked and that's the main difference I saw. As for performance, I have no idea about tech improvements, but I imagine they're relatively similar in size and performance.