I was curious about the Grundig G4, because it looked like a sibling of my enduring favorite, the Kaito 1102. Its disappearance from online radio retail catalogs and appearance on Eton's "past collection" page had me confused.
My curiosity in the Grundig G4 was a passing interest, because some issues turned me off. It appeared like another Eton move to take an existing product, slightly redesign it, and sell it for twice the original price (Kaito 1102 became Grundig G4; Kaito 1103/1106 became Eton E5/Grundig G5). I'm not interested in onboard digital audio recording, and one review I saw on an online retailer's website highlighted that the radio's user interface isn't suited for managing files on an SD card.
More information about this discontinued Eton/Grundig product can be found in the Passport to World Band Radio review: Grundig G4 introduced, dropped. The review was intended for the 25th edition of the book for 2009, before the radio was cancelled.