On another detecting forum , not sure Im allowed to name other forums on here , the F2 gets many times more great reviews and reccomendations than the ace , even by tesoro and garrett loyalists. The benefits of the faster retune speed and the numerical ID readout seem to the most talked about abilities spoken of in comparisons between the f2 and the ace. I myself have had an ace 250 for 3 years and Im pretty proficient with it and I like it , but after realizing all the frustrating quirks the ace has and having to learn to use the machine in spite of them I kinda think if I had to do it all over again I may choose the f2 instead. The faster retune speed alone "could" equal more finds and less trouble in trashy areas. The f2 is also supposed to do a lot less falsing than the ace. Ive found over $300 with the ace and a gold ring , so I cant complain about it too much but , I learned to use the ace pretty quick but it did take a lot longer to learn how to use it to its FULL potential than it should have in my opinion for an entry level detector. Opinions vary but Ive read enough posts on it to believe the f2 probably kicks the aces behind. And I prefer garrett over fisher detectors.