It's pretty good: the components are heavy duty and likely to last. The bendable and somewhat twistable main bar will hold most SLRs as long as you're not using a really long tele lens.
The connector pins are well made but the design could use some rethinking. Major negative: no instructions or diagrams are provided. This should be done ASAP. There are parts included which really help adapt the device to a variety of possible wheelchair designs but I would never have guessed how to use them until I called the company, AlzoDigital. Their rep was super helpful and helped me more fully understand the device so I can help my client get the most use out of it. I have searched diligently but cannot find any other mount worth considering. I am an Assistive Technology Specialist and this device is one I'll recommend again.