Went out yesterday to the local school ground with my F70 with 6" oval coil. Didn't find any old coins but was finding clad dimes at 7" loud and clear with ID at 68, this is one really amazing little coil. I was also able to run my 70 on SL mode, sens at 80, thres at -3 (that's where I keep it) with no falsing at all. I've tried this with the stock coil and the chattering will drive you crazy, what a difference this little coil makes. Question: has anyone tried using SL with the F75's stock coil on the F70 and if so, how was the chattering? Thinking about getting this coil. Thanks, HH