"Leverages UDMA 7 technology to provide industry-leading 1000x (150MB/s) minimum guaranteed sustained read transfer speed* *Minimum 150MB/s read transfer, write speeds lower. Speeds based on TestMetrix certified tester. Actual sustained speed may vary depending on host device.
The CF Association has only recently released a specification for 120 MB/s speeds. While Lexar may promote a faster speed, it is more likely marketing spin and unlikely to materially impact performance. http://compactflash.org/product-types/cf-cards/
"The CF 6.0 specification has just been introduced and these cards are expected to support up to 120 MB/s and these cards support the Sanitize command (the ultimate card refresh)."
But the CF Association does say: "To get the most out of your CF card purchase, match or exceed the host (camera) capability with the CF storage card version. For camera use, both the write speed in camera and the read speed for later image processing should be considered."
What this means is unless your camera can also write at peak speeds, there is no advantage to a faster card.
It's interesting that Sandisk also has a new CF card. They promise 100 mb/s write speed with read speed being lower. Apparently they have tuned the CF card for maximum write speed which is probably more important for photography. "Up to 100MB/sec write speed, read speed lower. Based on SanDisk internal testing: performance may be lower depending upon host device." http://www.sandisk.com/microsites/compactflash/index.html#tab1
Again - you will run into the limit the of the camera's processor.
I woudl be perfectly comfortable with a top end card from Lexar or Sandisk. To save money, I would probably go with one cheaper iteration - for example the top end Sandisk Extreme over the Extreme Pro.