I snagged another Nikon F90X as a backup and to have two rolls of different film on the go at the same time. I really wanted a data back (mainly for automatically bracketing exposures which is not possible without it) and this came with the MF-26 back and the MB-10 battery pack all for around £70. I saw data backs separately for around £30 so to get all this kit for £70 seemed quite a good deal.