Anyone tried the new SSD "boost" / caching device ?

[mikerr]

I've just been looking at this interesting device scan are selling:

DDBOOST will carry out the action of mirror backup right after the initial installation. This action will copy the front-end data of the original system hard drive to the SSD sequentially (assuming that the capacity of SSD is smaller than HDD.).

After the initial mirroring of data is completed, SSD and HDD will have the same front -end data. HDDBOOST’s controller chip will then set data read priority to SSD to take advantage of SSD’s much faster read speed. HDDBOOST’s priority will be determined by the following rules:

1.When data is present on both drives, read from SSD.
2.When data is not present on both drives, read from HDD.
3.Data will only be written to HDD.

Every time the system starts, HDDBOOST will initiate mirror backup automatically to ensure front-end data between the two drives are the same.

http://www.scan.co.uk/Products/Silve...our-Normal-HDD £35.23

http://www.silverstonetek.com/produc...BOOST&area=usa

Looks good, but only updates the SSD mirror on a reboot? not clear if its a whole drive, or first partition mirror either.