I bought a RAV charger that does literally the exact same thing (7.5W charging) for $30 a month or 2 ago.
This....is funny? Though perhaps the joke is on me for paying an extra $10-15 for have the capability to charge from 5W to 7.5, which is hardly noticeable.
If I had to do it all over again, I'd get the $15 one off Amazon.
Really think about this, if you're truly spending 45 extra dollars so that you can charge 2 seconds faster, something literally no one will notice, then I have a overcoat in the Sahara to sell you.