Bought the wcw backpack and its has worked continuously for nearly a year (lost one day). Only trouble was the pressure valve breaking down, which wcw kindly sent me another as it was under warranty. I decided to buy another pump and changed it for the original (there's a thread on here somewhere).While I had it to bits, I tightened all battery connectors as they fall off at the drop of a hat, and also changed all external and internal hosing for microbore hosing, so its all a nice yellow colour now
, and its all working fine.
Have just ordered my sureflo and varistream for van, so it might be taking a backseat now, but its certainly earnt its money over and over again. Cannot really fault it for the price.