Though relatively new to detecting - 3 years now - I took Tom D's advice and invested in a F75SE about 10 months ago. A lot to handle at first, but with all the information available now through the generosity of those on the Forums, I was able to learn it pretty quickly. Last night, went two blocks from my home where a house was recently torn down and the ground freshly 'dozed'. In an hour of remaining light I found 9 civil war bullets, a button, a percussion cap, and an 1888 silver British six pence - this amongst all the nails and deep junk. The beauty of this unit is that you can try a number of settings to run as quiet or as raw as you like. I have learned to listen through 4 tone disc (around 6) and all metal at 99 sensitivity. Light weight, fast as can be, 40 hours on batteries (you forget how long ago you changed them!). I can run ultra slow and clean everything from a site, or change settings and breeze through when time is short.
I own a CZ5 that I really like, but a buddy has it on long term borrow, an Eagle Spectrum and a Compadre. Traded an MXT and a Bandido 2 uMax for the F75 and rarely if ever take anything else out in the field. Would love to try the Fors Core and the Deus, but I know the F75 is telling me everything that's in the ground below me - it's up to me to be diligent and discern what it's seeing.