Don't wait. Get a pair of the currently cheap and discontinued ones. I have the non-zip model but so far these are some of the longest lasting I have ever owned. I do so much bush whacking that my experiences with waders usually is in the months and never years. These things are surprisingly durable at having lasted about 10 months of abuse.

Why wait for an as of yet unproven durability feature (the sonic thing) when I can tell you for certain with no special favors from Redington that the CPX are a hell of a good deal right now. Usually discontinued waders are crap and leak and are thus discontinued but I think Redington simply is working really hard to get rid of the terrible customer experiences from their earlier wader products by updating the CPX so soon. I know a few guys that hated Redington after buying their waders but these CPX are a different thing.

I have tried these particular waders:

-Cabelas Wet Plus

-Patagucci Wetmaster

-Simms GWet

-Orvis Pro Wet

No wader keeps me dry for long but these have. In fact you know what blew out on mine yesterday at the river? One of the buckles on the suspender straps. That is a first for me in many years. A pair of waders whose buckle broke before they leaked.

In summary, I am glad I have a brand new pair sitting in a box next to my fishing rods.