I had a run in with them with some landcruiser stuff I bought...
I killed a CV joint and bought one of their CV's and new swivel housing bearings too, as they had been full of shrapnel from the exploding CV...
The new milners Cv joint lasted less than 3 minutes off road (I didnt tell them I was running 38's and a front locker mind

)
They agreed to change the CV under warranty, but I had a battle and half to try and get new swivel bearings as they were now full of chunks of metal...
Plus they wanted my busted joint back for examination for a week or two before they made a decision, meaning the truck was off the road.
Finally got there, but only when I threatened to get onto my creditcard company, but I wouldnt buy anything off them again unless they were loads cheaper and I could live with the hassle if the item screwed up.