Vigilante, standard SD can't go more than 2GB. It is a different standard internally. As for speed, this will be a slower transfer than a Class 4 card, but some of us have more time than money. It is also not a good choice for burst mode or video. This is an amazing price.

Backup

I use it as a backup for my Canon HF-10 HDV. Nice to have as a backup. Mabe a bit small for the HD Resolution, but good to have as an extra backup.

Reliable Performance; Writes/Reads fast

Small for HD resolution