... I have tried Google to no avail - just basic home use stuff
one, you mean?
To be honest, in this case kit from both the Amazons of the world and the "well respected brands" (see above) appears - to my eyes at least - to be much of a muchness. In fact many appear to be identical, and almost certainly from the same OEM (in China, no doubt).
I wouldn't spend too much time on it; just follow whatever the Physios advise (and use themselves, even), as Dustcap suggests.