There are three places in the bed that the screw that attaches the camera can be located, none of which allow my camera, a diminutive Sony a6000, to sit flat on the bed as it comes to rest on one of the cap screws that hold the wheel assemblies in place. So you really need the arm… or a longer screw and some shims to allow the camera to sit flat. That being said the dolly itself is wicked nice. Don’t know if it’s really fair to pull off a star for not being able to use it straight out the box as it’s a measure of my own misunderstanding… I’ll be getting an arm whenever they get them back in stock.
The quality of the wheels and frame seem fine for the price, but my one problem with the dolly is that one of the wheels only makes contact with the ground 30% of the time. Otherwise it just kind of floats and doesn't touch. This doesn't affect the performance too too much. You get what you pay for I suppose.
Cons: All four wheels won't touch the floor or surface you pan on.
I was so looking forward to this. When I received it, it was really wobbly. When you put it on a level surface, all four wheels are not on the ground, causing the skate dolly to wobble when you pan. I thought the weight of my Nikon would fix this, but the camera wasn't heavy enough. I emailed Monoprice to see if there were a fix for this and I got no reply. So I just returned it.
I recently purchased the camera skate dolly and I am very pleased so far. It is well built and works very well on many surfaces. It is a little smaller than I thought it would be and I had to add a shoe mount in order to fit my 7D onto it but I really like how that all came together.