I use the cardslots because my PC doesn't have built in SD Reader. Plus this added 3 more USB slots so I can connect my external hard drives. Great value and it saved space around my workstation area. Works as advertised, I am very impressed with this device.

great idea, keep looking. Each reader slot is an identity, it conflicts with other devices and has an ac adapter you won't be able to use. No manual included or on their website.