I had purchased a Lexar 32GB Professional 1000X CF card a few months back and had to return it because it had gone bad. The second replacement card had also gone bad. (Both had gone bad rather quickly, within a month) I had the second one replaced and sold it. Since I still needed a card to shoot with I purchased 4 Sandisk Extreme 16GB cards for my 7D. (This is not a rant against Lexar, I simply have no idea why those 2 cards went bad. Before those and after those I have had NO issues with any other cards I own)
The Extreme cards are fantastic, but I loved how fast the Lexar card cleared the buffer on my camera. Now that Sandisk has enhanced their Extreme Pro level of cards (without raising the price), I wanted to see how the new cards worked with my 7D.
My 32GB Sandisk Extreme Pro CF card showed up today in the mail. Got a great deal on it from Adorama.
I stuck a 16 Extreme card in and shot until the buffer was full (RAW), approx. 8-9 seconds to clear.
I then put the 32GB Extreme Pro card in and did the same thing, about 4-5 seconds to clear.
Not a HUGE increase, BUT almost twice as fast and IF you are wating on your buffer to clear before you can take another shot, each second waiting can feel like an eternity. LOL
Seems like for a few more bucks (about $90 bucks for a 32GB Extreme card vs $130 for an Extreme Pro) you can have a speed boost for your 7D.
I only brought this up because, before the V2 firmware update, the 7 did not seem to be able to take advantage of the UDMA 7 standard and now, after the V2 update, it can write at the faster speeds.