R4iDSi.co.uk Recommendation on R4 SDHC cards:

R4 SDHC superior to Original R4 DS for it support SDHC storage capability that boast the storage from 2GB up to 32GB. If you are familiar with R4 or any other flash cart, setting up the R4 SDHC is the same. Simply downloaded the latest firmware, extract the file and transfer the files onto the micro SD. Adding ROMs and Homebrew is simple. Once you have the micro SD card inserted into the card reader and the card reader connected to the computer which is a simple drag and drop. When it comes to navigating through the list of games and files, you'll need to use the directional pad and button A to select. Testing of homebrew worked flawlessly for most programs. There is only a couple that we encountered that did not work for us. In order to watch movies, you must use DPG tools to convert the files to a format Moon Shell will recognize. Playing movies is a nice feature to the R4 SDHC but the quality will not compare to that of the PSP. Its bland looking and there is no true touch screen navigation. So if you swear by R4i and only want R4, you may want to take a look at this if you're looking for SDHC support.
Comparing with the original R4 DS, R4 SDHC card is stronger in function and compatibility. R4DS only support Micro SD card less than 2GB, it doesn't support Wi-Fi, and lack of firmware update. R4 SDHC card is much better. It support Wi-Fi to update the firmware, it support Micro SDHC card up to 32GB. The most importance is, R4 SDHC card has powerful software and it supports many new DS games. It is compatible with Nintendo DS and Nintendo DS Lite console, if you want a flash card for DSi or 3DS, you can turn to our R4i for DSi, R4i for 3DS category.
Advantages:

• Good performance and reliability
• Quick loading times
• Takes up to 32GB memory

Drawbacks:

• No obvious drawbacks