I say that there is at least one downside to Nicopp trans lines vs steel, and that is strength. I used Nicopp on some trans lines on a Jeep I put together. On an out of town fishing trip, with a boat in tow, the outer ring of my balancer started walking off hub and ended up tearing serp belt up. Torn fragments of belt whipped around and grabbed one trans line and bent it 90 degrees. Had to cut and repair bent, leaking line on side of road. I think a steel line would have been pulled out of place, but certainly not bent 90 degrees. No more Nicopp trans lines for me.
