Originally Posted by geoxile
Those prices are insane, I have a hard time believing a 13 dollar pump would last several years.
Visit a manufacturer and see how things are made. You'll see a factory making the "official" branded product and more often than not, a factory next door building the same thing un-branded / OEM. The product costs the same to make and the customer pays for product development and support!
Its likely the same DDC product (the design is about 10 years old now), mechanical and electrical design - made cheaper by efficiencies of scale and cutting out the middle man. Also cutting the costs of a branded business: the engineering/development staff, support costs, marketing, etc..
Generally, you can get an understanding of reliability from the reviews and talking to the seller, but caveat emptor.
Keep in mind the devil is in the details, you should check every screw/washer, test the unit and what not to make sure everything is alright. I'd be doing this if I brought a "NAME BRAND" water cooling product anyway since water and computer components don't mix well, so why not cut out the middle man and save some money.