Functionally limited and still do not allow for the safest navigation. Haven't seen major improvement in over 100 years.
Cost $60,000 each for 8 years. Several month long wait times for dog matching. Training the dogs can take weeks to months with the owner.
Expensive devices that only enhance the functionality of the traditional cane by a small amount. Heavier and bulkier making them awkward to handle and cause increased hand strain.