No one said there was a problem. I am simply saying you can do much better.
When you say the miniPro is likely a reverse-engineered device I think maybe you mean a clone/counterfeit? I don’t think so. See is mini Pro a clone?30
If you are running Win XP on a dirt cheap computer (maybe it’s even old enough to still have RS 232 serial ports) and you really need the extra $50 then this may be for you. Myself, I would much prefer to plug in a USB device and be done with connectivity.
Look at the recent Com port problems connecting USB mini Pros/Hi Pros. It gets much harder when you also have to deal with USB-to-Serial adapters, and, if your USB-to-Serial adapter happens to not support the proper speed then you can multiply your connection problems by a bunch.
Oh, when you forget to unplug a serial Hi Pro with its extra power cord plugged into your 16-outlet power bar it will remain on all night using up electricity thus eating into the extra $50 that you saved.
Also your resale value will plummet. You can sell a mini Pro now for what you paid for it. The serial Hi Pros keep going lower and lower, except for the occasional sucker who doesn’t know which one he is buying.
The fast (zip/zoom) speed (though not required) is nice to have. Especially for some of the longer/slower Hearing Aid Firmware updates.
So to each his own. But I know you can do better.