I bought my DFX new about 12 years ago. I think it's a great machine and I've found thousands of coins with it, including hundreds of silver coins. I have always used the stock 950 coil on it, and coinshooting is my main goal.......deeper, older coins preferably. My question is......Will I gain anything by buying the D2? I've read it may be a little unstable to some DFX users. Is it worth my time and expense to invest in this coil? Or another coil? Thoughts?