The pump is submerged adding heat to the water - this may extend pump life by keeping the pump cooler, it will also create more work for the cooling loop.
The pump moves 30GPH... I didn't find a head rating but I personally guarantee you that the rating sucks ***.
The radiator is junk... it has a single pipe looped through copper fins and transfers heat very poorly compared to a heatercore.
The tubing is crap... It has springs inside it to keep it from kinking, which won't help the flow of water through already small tubing. This also highlights the trademark cheapness of Thermaltake products. Why not obtain decent quality tubing? What does this imply about the quality of the rest of the components in the unit?
It doesn't perform better than an slk series heatsink.
Summary: Basically everytime I look at something from thermaltake I notice where it seems like they are cutting corners on performance, and covering it up with flashing lights and shining LCD's. This product fits that mold pretty well.
If you just want something all in one and that works quietly, this should fit the bill. If you want good temps and high quality, look elsewhere.