found a review, not sure how credible the site is
I think they made some mistake in using the heatsink. It takes a mistake to get such high temperatures with it. Maybe too much thermal grease, or lack of grease, or a grain of sand, or some wrong placement. Whatever, with a fan even much smaller heatsinks perform better. The review length is also not convincing.
In general, thin-finned, thin-spaced heatsinks perform extremely well with fans. If you look inside a high-power 1U server, like 4-CPU dualcore Opteron with 4 HDD, feeding off 1000W PSU, and all in that 40mm of internal space, you'll often find lots of thin-spaced copper heatsinks inside, equipped with their 40mm fans. Same inside the PSU. These heatsinks are high-performance, and even not very well done would provide excellent cooling with a good fan, just from the looks. Unless TT really screwed up with thick layers of poor grease or something, but more likely it's the reviewer.
However, while excellent if air is forced through, they lack good natural convention. Not that they are bad, actually good, just the numerous thin fins you can rely on with a fan don't help nearly as much without it.
So, if going with a fan, TT might prove good (or even very good). If not, Scythe all the way, IMHO. Size is more important there than number of fins.
P.S. I myself have Zalman 7700Cu at minimal speed. What I like about it is cooling of all motherboard components, particularly the VRM. Even slow airflow is far better than none.