I have placed this product in the bottom space in my rack, where my outboard effects reside. As a bass player, I don't require to be near my effects during performance so I can simply slide the shelf out to access tuner and DI box etc. This obviously works for me as I have the rack on the floor, which means the pull-out shelf is on the ground and supported by the floor itself.
Pros - Excellent solution for outboard effects, strong velcro grip. Decent amount of surface area on the shelf. Latching switch to hold the shelf in place during transport.
Cons - The shelf takes up 2 spaces in the rack, but as soon as you add something like a Boss pedal, you will need some clearance above, so you're forced to leave an empty 1U slot free above the shelf. Approx 1/4 of the shelf is still inside the rack when it's fully slid out (No big deal).
Overall
A great solution to holding outboard effects, velcro grips are strong and sturdy. The overall build quality is excellent. Overall, very happy with this item.