I looked and the only change mentioned is the addition of a continuous noise cancel mode. Is there more that isn't mentioned?Have you downloaded and installed the firmware update yet? It will make a difference.
I learned an important lesson today. I had been getting tent stakes and bits of lobster traps all day. If you don't live in an area with abundant lobster traps, you should know that they are evil. They do sound like iron, but they also will squeal much higher tones. I don't know if it's because they are made of some type of alloy, or because of the grid shape of the metal, or because they often still have a lot of the plastic coating even when they've been smashed into 1 inch bits. A lot of the time the first thing you hear is the higher tone squeal, then the iron after.
Anyway after listening to that junk all day I got a pure iron signal that didn't squeak higher tones at all, so I said screw it and dug it. I tend to do this when I'm in the dry sand near the entrance to the beach. I like to remove rusty sharp things kids might step on if I can. I was slightly surprised when I spotted a dark colored chain sticking out of the sand. I thought at least it was something different, but when I picked it up I was dumbfounded to find a small 14 karat pendant. The signal was completely blocked by the chain, I never heard anything else but the iron chain. I took the pendant off and waved it at the detector and sure enough, it registered in the 40s.
Not 5 minutes later I found a 925 stamped ring, so I found my first gold and silver the same day right next to each other.