Pros: Good construction feel and great packaging. I'm not sure why some of the reviews down the instructions. I found them to be adequate. Installation was much easier than I expected and everything fit very nicely. On my i7-930 I got high 30's at idle and no higher than mid 60's at full load at stock clock with HT and Turbo boost enabled. This is with a push pull configuration. I assume it'd be better with fans optimized for static pressure. With the stock fan and the silenx fan I have on it, it is dead quiet! If you're looking for good budget cooling that doesn't take much space and is near silent, this is a wonderful product and a great alternative to the more popular closed loop water cooling solutions.

Cons: This is my first water cooling experience and like many, I worried about leaking. Sure enough it happened to me. After installing, I ran a video render that would push the cpu to see how it handles full load and everything seemed fine. I then played a game of LoL and roughly 10-15 minutes in, the game froze up and I had to restart. I smelled an odor coming from the case so I powered off the computer and popped open the case. Cooling fluid had dripped out of the return hose linkage onto my video card and got into the pci-e port. I then started the computer again to make sure it was still leaking and hit it with good ol prime95. There was no leaking until I started prime95 on default settings. Almost immediately, it began leaking at the same spot as mentioned previously. I took out the Seidon and put my stock cooler back on. I'm sure these are good coolers and most people considering going to water cooling probably had the same fears that I did. I'm just sad that I was one of the folks that had to experience it first hand. I can't give this anything more than 1 egg. I have good faith in Cooler Master products. I'm a big fan as my case is a from them and I had a TX3 air cooler on my older rig. I'm guessing I just happened to get one of the bad ones. I will be trying to RMA this or contacting Cooler Master directly and pray that my video card and/ or motherboard are fine.