I can say that i had the E-Trac and was always completely happy with it.
If there was something in the ground, i was sure that the E-Trac will find it!
Now i changed to the CTX because he has a faster ARM CPU and therefore a faster recovery time.
He also got some new toys, and a smart coil that makes it more resistent against magnetic noise.
Then he has FBS2 that will add few inches on depth as i see it.
He just scans more frequencies then the E-Trac. Its a fact.
It may not help with any target. But there will be targets where it help a lot.
Anyway. the E-Trac got so deep that i had to leave a lot of holes in the past.
I just switched to the CTX because its a nice toy and because i already knew every switch on the e-trac and it got boring

.
Let me say some PRO's and CONS:
PRO:
- the CTX has target trace and he shows two targets when in "Iron Coin" Mode.
- the Batterie holds a full day
- the design is so well done that you just want to stick it on the wall instead of take him into the dirt
- FBS2 makes it more sensitive
- SmartCoil makes it noise resistant
there are not much CONS:
- the User-Interface/ UI would need more buttons to be easier to use..
The CTX has more functions with less buttons. Means that you have to press more often and go through menus to get where you want.
- the display, there is a foil on it that you can easily scratch with you nail (happende to me)
- the price is so high that it will hardly pay out (but which hobby pays out?)
- he's a bit more waterproof, while i would not use it really for diving and rather get an excalibur for this.
PRO/CON ?
- If you use Exchange 2 and the GPS then it will uploads your search history to Minelab-server. Means you can access them from anywhere in the world - its like they are in a cloud.
Do you like clouds? If you do not like it, you can switch that off anytime.
- Its very stable material and a good battery, which together make it a bit more heavy and large on the other side.