Continuous line furler for screacher

My Weta came with a single line furler.This was changed to a continuous line furler after jams. I had two KZ furlers which lasted about four years each before becoming stiff and gravelly and now have something without a name - perhaps RWO - which looks like a copy which has also become rough running. I believe Allen have a new one on the market for 300 quid, Barton say they have but nobody has one for sale and Sea Sure have a new one which looks very like the three previous ones. Does anyone know how long this kit is supposed to last and what the current front runner is? The class standard is a Ronstan but I am not a millionaire!