This is a great memory stick it is compatible with many electrionics made my mainly sony.
I got this free when i purchased a w800i and i found it very handy as the phone did not have a very large memory only 32mb, this is like space for only 5 songs or 30 picture files depending on the quality. This on the other hand this memory card has 512mb which is like 16x more space as the phone memory. Now that is a lot.
Now the fransfer speed details for this priduct is listed below:
Transfer: 159 Mbit/s (20 MB/s)
Minimum write speed: 15 Mbit/s
Maximum write speed: 80 Mbit/s (High Speed PRO Duo)
This means that if you have a device that is capable of transfering up to the full speed of this memory stick then you will be able to fill it up within 30 secs as the transfer rate is 20mb/s.
This memory card is highly used and fully supported by most:
Sony Digital Cameras
Mobile phone (some mobiles M2 memory card widely used now)
This memory card come equipt with an Adaptor so it is compatible with more products.
I highly recomend getting this unless this is not enough space for you. If you are one of those people then currently 8gb version is the latest out so far but there will be possible up to 32gb memory stick.
This product can be purchased for as cheaply as £12.95 online. beware price at highstreet shops are fairly high.