the flash drives are pretty terrible - they are Samsung ones, and as of yet OSX does not support TRIM support for SSDs. this means that your SSD does not have some advanced optimisation features and it will slow down by about 30% after 6 months or so. in order to get this speed back you must go through a fairly lengthy process to reinstall the OS.
until TRIM support is offered for Macs i have not been recommending SSDs for general users. Garbage Collection is helping the problems, but you always want the native support rather then a "work around".
your decision in the end.