I spoke to Guhl Motors recently about reflashing mine. It was his suggestion to "take a look" at the F6B performance data before reflashing/installing the new data. While its most likely the same dyno data .. he felt it would be wise to insure before loading it up and sending it back.
Given the added time involved with "potentially new data" .. Ive elected to wait until end of season to pull and send mine in. He ballparked the whole process (Ship to/ D/L inspect/ analyze/ reflash / return ship) to be 7-14 day including ship time.
Altho who ever sends in the first F6B ECM will be the one that goes thru the analyze/verifying process ... all others will get the faster reflash only benefit.