Alex, I don't want this to sound like I'm having a go.
I bought an SLX a few week ago and I'm more than happy with it. It's the best pole I've ever used by such a long way.
I admit I havn't had any problems with the clamps as yet and maybe I won't ever have a problem. However, had I known that your wfp poles would soon have upgraded clamps, I would have waited before buying.
I can understand you have stock already made up and all that, etc.
I'm not suggesting advising customers months in advance or even a month but I bought the slx about the same time or shortly before the changes were made to the clamps. If I now get a problem it'll cost me time and money to fix something that was a known issue.