Hi 4space
I think that ad may be having you on about being "the best", though I'm not 100% sure.
First, ions are ions: simply charged particles which can be stripped off elements other than oxygen. I'm suspicious of the claims for "oxygen ions", as once the ions are stripped, to the best of my knowledge, they no longer have anything to do with oxygen! And the bio-ingestible stuff is then meaningless.
Second, the different scales of the photos showing Elanra filaments (tiny)compared with the huge close-up scale of the degraded element, is suspicious. Why not show like with like? The recommended way to clean the filaments is use a soft clean toothbrush. The way to tell when it's got dirty is that you can't feel a cold sizzle when putting your hand very close.
Ionisers have been around for many years, made by many manufacturers. The only "best" ioniser is, to my knowledge, one that claims to shield the device so that it emits no electromagnetic field (EMF), but sorry I can't remember the manufacturer's name. It seems an academic issue to me, as these devices run off a minuscule current. The EMF is therefore also negligible. So you might as well look for the cheapest you can find!
Regards, Gabriela