Up to now I have used Sandisk Extreme III (30MB/s) in my 40D and 7D. I am now looking to get a few more cards and I see that the Sandisk line up has changed with the Extreme III now being 60MB/s and the Ultra 30MB/s (was 15MB/s). Does this mean that I can now use the Ultra or is it worth it to go for a 60MB/s card (bearing in mind I have always got on alright with 30MB/s). Thanks in advance.


