Customers is not sick.A company that is likely to almost double...

Customers is not sick.
A company that is likely to almost double its gross profit per transaction by late 2008 is not sick.
Progress has gone according to plan, notwithstanding the delay in the RBA decision, which they had no control over. Recall that Customers had consistently acknowledged in their yearly reports that delays to the ATM Reforms were always a major risk. They were always upfront about this.

Customers has never promised more than they could deliver. They do not have a credibility problem.

If you've lost confidence in the company's ability to reach targets, then sell. But don't do it rashly - especially not out of frustration with the share's performance.
We're all frustrated with the stagnant share price, but the company is managed well.