Some of you guys probably haven't been around long enough to know but.. TR was making high end heatsinks before Noctua was in the HSF game. They all copy each other. TR was a pioneer, and did not patent anything.. the first time I saw a Noctua review, it looked like they used many of TR's manufacturing and design techniques. I know a lot of people put Noctua on a pedestal, but it really is uncalled for.
Just know that they all copy each other. It could be a dimension, a technique, a plating, whatever..