If you perceive "worth" as resulting from hp increases alone, then no, it won't satisfy your definition. But if you take into account the unsurpassed value of having a tune that's backed by FORD, which means that you don't have to worry about voiding your warranty (flash counters will expose 3rd party tuning) then FP's tune is of immeasurable value. Also note that the "minimalistic 10-15 hp gain" is no longer in question as FORD PERFORMANCE has corrected their chart to show hp results as "Base Premium Fuel vs FP Premium Fuel":
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Regarding the reduction of 0-60 times, the standard rule of thumb is 1/10 sec for every 10 hp. So a solid 30 hp increase would be at least 3/10 sec, and with the accompanying increase in torque, their could be something closer to 1/2 sec reduction in acceleration times.
And incidentally, a tune is "real" whether it produces 30 hp or 100 hp.