Interesting concept but compatibility still unproven

Malfunction or compatibility problems of SD reader, I do not have the answer:
Anyway, what I've experienced from a copy that was delivered to me (and I eventually returned):
Samsung Galaxy S3:
USB Port: Read / Write USB key (FAT32) RAS =
Port MicroSD: Read / Write on microSD (FAT32) RAS =
Port SD: Playable / Write impossible SD (FAT32) (*)

Samsung Galaxy S2:
USB Port: Read / Write USB key (FAT32) RAS =
MicroSD port: Not tested,
Port SD: Shuffle / Can not write to SD (FAT32) (*)

(*) Tests carried out with 2 SD cards formatted in FAT32 from a PC (SDformatter), then renewed with SD cards formatted from a camera.

Note: Although this kit is identified compatible with the Galaxy S3 on the site, the kit is delivered clearly marked only compatible S2!