Amazing product. Feels great and solid. The rails are internally threaded so you can add. The grip is great and holds up well. There are threads all over the place, and this one has a cute block of cheese. There are two threaded side strips; one for shorter cameras and one for taller cameras. I use mine with a Canon 70d. I have access to my entire camera. Batteries, HDMI/AV/MIC I/O, buttons and screen can still shake normally. It came with a cold shoe so I bought 2 more for lighting and monitor. Since I'm using a taller side rail, I thread the shorter rail through the hole in the handle and I have a T-bar to which I attach the mic and light. Ahead is room for a tracking focus already on its way. But after adding this incognito is no more. I can't take the camera anywhere until I'm asked about my subjects.