Robin,
I got one just a few days ago so take this with a grain of salt..... I first tried it out in my yard which I had hunted a million times with my XS and F-75. First signal I dug was a Buffalo nickel, and also got a wheat cent. Pretty rare to find anything here anymore so that was fairly impressive. But then I went to a favorite site of mine that has yielded hundreds of silver and IHs; when I first started detecting there I was barely able to stand up between signals. It had been detected before but I was the first to hit it with an Explorer. The place is littered with nails, I was hoping the CTX with it's faster response would make it come alive again. Well, three hours with the CTX and barely any signals, dug mainly trash that I didn't dig with my XS. And... I was hoping with the coil having some of the electronics it would behave better around power lines and let me run a higher sensitivity in urban areas, not looking that way thus far.
Now this is with the out of the box settings, I still have lots of experimenting to do. With my XS I went from recommended settings to open screen ferrous within a couple of weeks of getting it and never looked back. And it took years of use to learn the subtleties of is language.
So my gut feeling is that if you are competent with your explorer you are not missing much. I'm wondering if some of the people that saw a big difference were people that ran lots of discrimination on their older models; perhaps the faster response here helped them out.
Again, I'm hoping that as I learn more and play around I'll see different results, and there are enough features like water proof and balance that are certainly nice.
Hopefully have a few more days before freeze up. I will keep you updated.
Chris