As long as there are eleventy different makers of e-reading devices, there will most likely be eleventy different "official" names for it.
If you want to call it Liseueseuuessess or something else is really irrelevant. I like the Liseuese word myself, but it's not as if I say "It's a liseuse" when someone asks me about the device when I am using it in public. That would most likely make most people who have not seen the light of electronic reading yet go "huh?", drool a bit and then scamper off to their cave again.
I usually just present it as an electronic book reader, which describes what it does more than present a name for it. Any followup questions I usually refer to it as an e-reader or e-läsare (in swedish).
If an oficial name for the device is ever adopted, which I doubt. I would be happy about it, but most likely I'd continue to call it Frack! anyway.