There are other things to consider before buying a propritary hearing aid programming device that is going obsoilete. If you are only interested in programming (old) Boleros then yes it works (for now), and it’s cheap.
Did you know that it can brick your hearing aids because it doesn’t work well with current versions of Phonak Target 8.? Though, there is a workaround to revert back to an old version of Target and use the Factory Reset tool to unbrick your hearing aids, and then continue to program them using the older version of Target.
If you plan to upgrade your hearing aids in the future you may want to study your choice of hardware/hearing aid programming device more carefully.