The DSONEi comes in a slightly fancier looking box. Inside the silver box is a plastic, velvety tray that holds the DSONEi card, the USB firmware writer and the MicroSD reader. This reader is also SDHC compatible and seems quite sturdy.

Pros:
Better build quality
Has an in-game game guide feature
Multimedia playback from within the interface
Superior homebrew support (ScummVM DS works correctly)
Inclusion of USB Firmware writer

Cons:
GUI is outdated and annoyingly slow
Save files do not support long file names (meaning you will need to rename any save file over eight characters long to make it work)

Supercard DSONEi official features list:
Plug’n Play – No extra software needed.
100% game compatibility.
Uses MicroSD card, both FAT16 and FAT32 supported.
Supports the SDHC specification, allowing for high capacity memory cards.
Compatible with all speed flash memory cards.
Hardware save, multi-save support.
Save directly to MicroSD rather than onboard flash.
Support RESET, RealTime Cheat Code and RealTime Game Guide.
Micro firmware designed. Upgradable Operation System with powerful function and friendly GUI.
Support MP3, Movie, TXT and view PIC directly.

Box Contents:
1x Supercard DSONEi
1x USB Firmware Writer
1x Micro SD/SDHC USB card reader

Where to buy:
Supercard DSONEi is currently available at GameYeeeah at the price of 22.99 euro with the FREE SHIPPING via China Post Airmail.
http://www.gameyeeeah.com/supercard-dsonei-for-dsi-supercard-ds-onei-p-1694.html