I just bought this for my T3i and it doesn't block access to any controls. I don't have a tripod, so I can't speak to that, but all control buttons are free and clear. You do have to remove the base of this to take the battery in and out, but it's unbelieveably easy to remove. No tools are needed, you just turn the dial clockwise or counterclockwise. Takes less than a minute. I was worried about that but I have to laugh now that I've got it - it's no trouble at all. As others have said, it's a bit of a pain that your camera can't sit flat with this attached, but honestly, if you need to set it down for a longer while you could just turn the dial, unscrew the base, keep the top connected and let the strap "flap open" at the bottom. When you're ready to use it again, just dial the base back in.