Feed Back Please

I'm interested in purchasing the Canon EF 1.4 x II and or III extenders to use it with my 5D /2 & 7D & 70-200mm 2.8 IS. I do a bit of Sports shooting out & indoors inc of motor bike racing.


I have read Brian's excellent reviews, but would like to have some feed back of you guys who have or are using this combo in real life action.


Also is the a real difference between the 2 and 3 ext's, as their is in their pricing.


Thanks and Regards, Wally

Bryan just posted the comparison charts


www.the-digital-picture.com/.../ISO-12233-Sample-Crops.aspx

Thanks Mate.