This is a great little memory stick! I use it in my PSP and it has loads of memory to store game saves, Music, films and pictures on! I can store about 500 music tracks on it and still have enough memory left for other things like full length films to watch when I'm on the move. This card is also a lot cheaper than the official sony memory which is exactly the same but you pay for the 'Sony' bit in it...The speed is great in this little memory card, It transfers music and pictures lightening fast. It takes around 5 seconds to transfer a music track and around 2 seconds for a picture, It really is that good! The quality in this card is great, It is very small but the build quality feels excellent. It comes in a handy carry case incase you take it out and don't want to loose it.