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its an xcal 2 ...only diference is that instead of being the 9400 model it is the 9145or the SF(Stategy Flash) which means it come preloaded with tune for 10 to 12 ford cars and trucks. It is the same thing ...if you wish to get a custom tune later on , the software can be changed with a simple dowload from SCT. The SF is a bit more $since it already comes with canned tunes for a lot of cars.
If your willing to spend the money get the more expensive one cause the x-cal sf has problems with the canned tune for the 2005+ v6. the sct website has the fixes for it though