I preferred the Teknetics T2 to the Fisher F75. I owned 3 of the F75' and 6+ T2's, do some urban Coin Hunting but mostly spend my time hunting dense debris sites that abound in iron trash. Those models were all out-performed by the Nokta FORS CoRe, and also out-classed with the FORS Relic, Makro Racer 2 and Nokta Impact and now the new Makro Multi-Kruzer. The F75 and T2 are OK detectors and work for many people depending upon where they mainly hunt, and if they are not as determined to unmask good targets in a very dense masking-trash site like I do.
My Regular-Use Detector 'Team' is comprised of an Impact, two Relic units, 2 CoRe units, 2 White's MX-7s and two Racer 2's, a Multi-Kruzer plus a Tesoro Vaquero and Mojave. Each one is at-the-ready with a search coil mounted for specific hunting needs, from dense, contaminated trashy sites to the better low-to-moderate trash environments. I have extra search coils in my Accessory Coil Tote, and in the case of the Impact I keep the very versatile 7" Concentric coil mounted, and for trashy places I have the 5" DD mounted on its own lower rod for quick changes afield.
As Beyonder and Cal Cobra mentioned, these models can all out-perform the F75 in many search environments and my Impact and a few other models are loaded right now for a day afield ... if the rain stays stopped for a while after sunrise. The Impact is a great detector choice.
Monte