Should I exchange my EX1 for a EX3?

The lens looks good. However I'm being told the Letus Extreme has a backfocus problem. You constantly have to adjust it and it is difficult to get to it. They've corrected the problem on the Letus Elite but the pricetag is very high. Do you know of the least expensive way to get the job done? Is Letus really the way to go.
 
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