I also just bought a new excal II and my observations are as follows. I have only owned this machine for 3 days. 1. The best investment you can make is an aftermarket battery and charger. I bought one with the charger, which has a light on it, when I bought the machine. The stock factory battery is only 1000ma and the aftermarket battery is 1600ma. You will need a alkaline pod to put it in if you don't want to remove the battery from the factory pod. The charger has a light on it indicating state of charge. To me, this battery and charger is an absolute must ! 2. The headphones are AWEFUL and need a chin strap to seal them to your ears. I can't imagine how many targets I have missed because I didn't hear the change in threshold

. On the flip side I guess you could get a set of HY80 gel pads and it might be an " in warranty " fix / bandaid. All I can say is SHAME ON YOU MINELAB for these headphones on a high end unit. 3. The knobs, to me, have no issue if you don't man handle them. I hunt in reverse disc and I have had no trouble with the knobs , "yet". I do have a set of Anderson's when and if that becomes an issue. 4. This machine is a depth monster. I am digging things that I'm sure my V3i would not even responded to. I plan on doing tests to see if it really is finding targets the the V3i just can't see. I run the V3i wide open with little to no disc. I am also running the excal wide open. I run it low threshold (real headphones needed for best results ) , disc on 1 ( absolutely not on auto if you want the best depth ), volume wide open, sensitivity on 10 and hunt in reverse discrimination. This is the first NON DISPLAY unit I have ever owned and I LOVE IT. There is something to be said for not being distracted by a display and concentrating on just the tones. I certainly DO NOT know the tones yet but I'm listening to a cd that someone made for excal tone training . Sorry I can't remember his name right now. It might be a good investment for you. I'm digging "whisper" breaks in the threshold that return a good disc tone that turn out to be a coin at almost 2 feet !!!!! At the end of the day, I'm probably going to kill my warranty and put a set of GGA headphones on it and do the pinpoint mod. This machine REALLY REALLY needs this 2 things to be the most effective and for ease of use. I also immediately ditched the stock shaft and bought an Anderson straight shaft for it. I think there are better shafts out there like the plugger. The arm cuff strap on the Anderson is not user friendly for changes in size on the fly. They need to rethink the strap and go with a long time proven Velcro strap. If anyone knows where to get a replacement velcro strap for the anderson, PLEASE let me know. the anderson strap has stitching on it that digs into your skin after a few hours use. I'm certainly no pro at this and my observations may be way off base but its just my .02 cents worth.