The AHD-M model seems to support up to 8 channels at the moment. Others have 16-32 channels. Most of my customers now use 16-channel (or more) DVRs, so it is not yet fully replaceable.
AHD’s DVR still has many advantages, such as analog, coaxial, and network-wide access. It is compatible with analog and quasi-HD coexistence to a certain extent. In addition, the program is open and does have certain prospects. However, as mentioned above, there are still many practical problems, so I can only wait and see.