I don't know if you guys are aware of this, but the same day that r4ids.cn released a video on firmware 3.0 (emuNAND update), 3DS Link released the same video, and you cannot see the card they used in the video, so with both companies claiming that this firmware works, that means they are basically the same card? The 3DS Link can be found for around $10 less then the R4, making it the better deal right now, in my opinion.
3DS Link video: http://cn.3dslink.com/3dslink-news
R4 Video: http://www.r4ids.cn/news.htm
3DS Link video: http://cn.3dslink.com/3dslink-news
R4 Video: http://www.r4ids.cn/news.htm