I guess the real question is how much they would cost. One of the big advantages of the GFCI device is the lower price, compared to a breaker. This still looks like it would be aimed at the retrofit market and if someone really does have that old a panel, they probably need a panel upgrade anyway.
I can see using the device, next to the panel, for a small addition though, if the AHJ only required the new work be AFCI. Without device AFCI protection available, you would be setting a small sub panel.
For that use, you would want a dead front device.
