Yeah, that's a little bit of weak sauce for them to do that...although I'll bet you are not the first.
Yes, class 4 is faster than a class 2. Didn't really know what the differences were, but this link has a pretty good summary of speed comparisons amongst the different classes:
The Speed Class Rating is the official unit of speed measurement for SD Cards, defined by the SD Association. The Class number represents a multiple of 8 Mbits/s (1 MB/s), and meets the least sustained write speeds for a card in a fragmented state.
These are the ratings of all currently available cards:
Class 2, 2 MB/s
Class 4, 4 MB/s
Class 6, 6 MB/s
Class 10, 10 MB/s
Give 'em a call and ask them if they'll give you a class 4 one instead. Can't hurt.
I do think you are right. There was discussion right before launch last year as to what class card would ship. I think the consensus was a class 2 card. I've never pulled mine to look at it though...
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