I was recently given one of these for free at a promotional Sony event. I was impressed by the quality of it for a free product and it has performed as well as any more expensive one.
It is 1Gb which is more than enough for storing and carrying word and excel files as well as the occasional mp3 collection or video. I use mine for carrying around Uni work and have found it to be flawless.
The USB connector slides into the housing rather than having a cap that goes on to it. I find that this is more useful as there is one fewer part to lose or break. The sliding action is smooth and has a reassuring and positive click.
The stick uses USB 2.0 technology so is fast and reliable and can transfer its entire contents in a very short time.
I'm not sure how much these sell for normally but I would recommend one. Although to be honest most USB sticks are the same these days.