I use a usb powered hard drive with out issue. If the PS3 were to stick to the recognized usb specification (which they have) it would have to work. My PS3 only has 2 ports and I use a generic hub without issue.
You can tell a product is shoddy; while new it doesn't have a standardized price. Means the manufacturer has no idea what it's product is worth, so it told it's distributors to place the highest amount they think they can get for it. On it's USA based distributor list the price range goes from $40.50-68.00. Kind of sketchy.
I have a question, My Ps3break will be arriving soon, but after reading all the comments and reviews of it being dodgy, i am planning to get more genuine upgradeable Jailbreak Usb, which will again take more time to reach, so will i be able to copy games with this meanwhile and later use other dongle without having to reinstall the games again ??