I have one I bought used and pretty cheap- original Exos.
Works pretty good, really- cooling cpu, gpu and chipset with a mobo that reads high.
CPU temp never gets above 52c or so, worst case, and I know that system is ok to about 58c. Best it has been was one of my custom H2O setups and even then it was about 47c.
I wouldn't pay the money for a brandy NEW one, but I have been water cooling for a few years now...
I still like to mess with other stuff when I can get it cheap though.
The newer ones are supposed to be a bit better, but they still will lose out to a decent home-brew setup, and cost more as well.
They are pretty easy though.
(PS- this should be in the Water Cooling section, methinks.
)