Bought a moser bear swivel pen drive of 8GB capacity online this weak. It worked fine but when I tried to transfer some big data( >1gb) , just found out that it is too slow. The speed is less than 3 mbps which is verg slow. It took me around half an hour to transfer the movie from my hardisk to pen drive. Don't know if it is faulty or all the Moser Baer's pendrives are that like only.
And if you have to transfer really big data then you have to wait patiently for a long period of time. So think and choose wisely.