Giottos MH631 and MH621 quick release systems review
I use these systems on every shoot, and I find them incredibly useful. They allow me to easily switch my camera between systems. I currently have four of them. (I think I had only two when I shot the review.) One on my glidecam, two in my slider system (I'll post a video about that soon) and one on my tripod. If needed I would also have one on my shoulder rig but I'm not using that much at the moment.
Usability - 5/5 (See video)
Functions/features - 4/5 (I would like to see mounting points on all sides, not just one.) Safety/strength - 5/5
Price - 4/5 (it could potentially be cheaper, but definitely worth the £23 I paid, in fact, I am planning on getting another one or two.)
Final score - 4.5/5 I would not leave for a shoot without these.