Amazing Powerhead Price -- Too good to be true?

Guys so I just saw these power heads on amazon and the price is AMAZING. I was thinking of maybe getting the 1300GPH 2 pack for my 29 gallon biocube. Can you guys take a look at this link and tell me if these powerheads aren't good or something. The price is amazing... but I feel like it's too amazing... http://ift.tt/1FsveD4