I'm don't think it is any deeper than the earlier explorer's, and not sure if it is faster. It has a lot of neat features.
My big beef is display, this was recently discussed on a thread on this forum about target ID bounce. I really like the original XS, or at least pre-Etac FBS series. Those earlier models used the whole display for target identification, on the CTX almost anything of interest lands on the 12 ferrous line, which pretty much defeats the purpose of a two dimensional screen. On the explorer a nickel hits lower middle, fat indian slightly above, regular indian up towards the upper right, silver farther over, etc, etc. On the CTX the ID basically jumps a few pixels left or right, and you are relying on only one number for identification. It may be more accurate than the older models on the conductive number (not positive on this) but again trash will throw this off and you end up having to dig more stuff.
I know of many explorer users that share this opinion, and see no reason Minelab couldn't offer the non 12 mapped set up as a menu option. I still have my CTX, but my original XS remains my go to detector.
Chris