I just got a used 5.3 coil for my V3i and took it for a test run this am. I have tried many small coils on the various detectors I have owned over the years and some were good and some not so good. On a couple of detector with a display and tones, the small coil would not have the same numbers and tones as the stock coil. I have never had this happen on any Whites detector I have owned so when I hooked the 5.3 on my V3i, it had identical tones and numbers. I went to a spot where there are silver and wheats mixed in with recent clad at shallow depths. After a short time of getting use to the light weight and small profile, the coins started popping. The first four coins were numbers in the high 60's - low 70's and as expected, they were copper memorials from 2 to 3 inches. The fifth target was between 78-81 and showed about 5 inches deep on the gauge. I have only found a couple of wheats in this depth range in previous hunts and guessed this coin would be a clad dime. I was more than happy to see a silver dime come to light. It was a 1946 roosie. Dead on numbers and tones. I have tried the 4x6 dd coil on my old DFX, but always preferred the slightly bigger 5.3 and it's ability to correctly ID newer trash. It is the perfect coil for the V3i. I did an unscientific test before I started hunting concerning recovery delay. I laid a nickel, clad dime, clad quarter on the ground with about 4 inches separating them. I used my usual slow sweep speed and adjusted the recovery until the signal hit as the center of the coil passed over each coin. Too low of a number and the target was way behind the signal. I settled on a setting of 48 and had absolutely no problem with depth or lag. I am by no means an expert with the V3i, but after reading hundreds of posts, I am gaining a high degree of respect for what it is capable of doing. After several hours of using the small coil, I still had some energy left so I put the stock coil back on and headed for the oldest part of the fairgrounds. I went to the exact spot where I had found many Indians Heads with my DFX and decided to try another experiment. There is little emi in this spot and there is not too much modern trash. Using my modified "high pro" program I turned the gain from 11 to 8 and turned on the boost. I went less than four feet and got a signal in the 50's that bounced all over the place. I have found at least 15 Indian Heads within ten feet of this spot and I have used EVERY big buck detectors since trying to find "one more" Indian. When I dug this target, I found a small piece of copper wire first. I had a feeling that there was something else close by and I rechecked the hole with my pinpointer and got another target slightly deeper. From 7 inches comes a green coin. Amazing, it was an Indian. I am still learning this detector and I seem to find good things almost every time out. PS, I did not find any more older coins while hunting in boost, but I did find many more clad coins. I was certain there was not much left, but I was wrong. R.L.