I bought a used F75 LTD SE a couple months ago and have had some success with it in the fields. I have no problem with chatter since my existing detector was the F4 and I have grown to expect a little chatter. I can't comment on the minelab since I have never handled one. The deal I purchased was $1600 worth of metal detecting gear including the F75 LTD SE and a White's coinmaster detector for $800. Since the ground is frozen I am contemplating in getting mine upgraded with some of the clad I found this season.
What areas do you want to hunt where you need extra depth? I am doing more plowed fields now, that's the reason I purchased the F75. If I was going to continue on detecting public parks, schools, and some private properties, I'd have been happy with my F4 capabilities and not bought the F75 LTD SE..