Try to keep an open mind for just a moment. In the history of TT, they have created knockoff after knockoff, and executed with less success than the original part. This is what earned it the rep it has, at least in many circles, but in particular the SilentPCReview croud. This is what has made it impossible for anyone over there to even consider that TT might've screwed up in screwing up its knockoffs, and actually created a good product. In my mind, they would not be the first to consult in such an issue as the one at hand here.
Now, a couple of points worth noting, first is that the fan that comes with the BT is, AFAIK, made by Yate Loon, who I think is the same as Globe, who makes fans for Nexus. It doesn't get much quieter than that fan. It is also optimal for the heatsink as proven by using far noisier fans results in only one or two degrees in difference.
The second point is that, even though I have used ThermalRight heatsinks since the AX7, and I stand behind its products, apparently they finish the XP120 base before the HP are applied with solder, and the heating and cooling causes a bit of concavity in the base, thereby hurting performance somewhat. Even with the mirror finish, it is not making optimal contact from the factory, whereas you'd be hardpressed to shave with the reflection of a BT base, it is at least flat, so that the TIM is able to do its job optimally. Admittedly, I haven't looked into proof of the concavity, so this could be considered null. Though TR may not be infallibe.
However, couple the fact that the BT is cheaper than its competition, and comes with an optimal fan I will just say it. Even though its mounting is iffy and its weight (even with most of it concentrated in the base and HP rather than the aluminum fins) is unsafe for portable systems, it is the best bang for the buck in the pricerange, and is the only choice for socket A systems with mounting holes.
Also the BT can be improved a couple of degrees by
bending its fins like so to fill the voids. The jury is still out on whether the gaps were intentional to relieve backpressure and that this mod can cause undue stress on the fan and added noise, but it's interesting.