Here are my thoughts since I have a CTX, two Excals and had a GT. I primarily hunt the water (Gulf) and wet sand, when I would go to hunt knowing I would be hunting the wet sand and not the water, the GT came out to play, I loved how the machine worked BUT there were to many times that I wanted to go into the water so I bought an Excal. I switched over to the Excal and used it for both wet and water hunting unless the surf was to bad, then the GT came out again. When I bought the CTX, I used it for a few weeks (during the peak season) and had trouble learning the machine, I found out I had a coil problem so it got sent in for a checkup, while it was gone, I went on a tear with the Excal on gold. When the CTX came back and was working properly, I hit on some gold and it kept on coming, the GT sat and eventually got sold, I bought yet another Excal (blue) and have gone off the CTX for a few weeks just to try the Excals....I did get gold but not what I have been getting with the CTX. Now the Excals are just a backup machines, which will eventually get sold when I decide to get a second CTX to use as a backup.
BUT
Like any machine, IF you don't take the time to learn what all the machine is telling you, you will not get the most out of the CTX and the Excal./ GT would be a better combination. There is just to much information given to the operator (on the CTX) as to what the target is under the coil. Target Trace is an amazing tool and the ability of the machine to show more than one target is another. The CTX is not infallible and can be fooled as can any machine (and hunter) but with the additional information available, you can make a better decision whether to dig or not.
AND
You will have to take care of the CTX and be a little more diligent of maintenance. I have close to or over 400 hours with the unit submerged in the Gulf, I had one minor leakage problem because I took a shortcut once in my usual routine..... hasn't happened again and I feel confident it won't provided I take the time to take care of the machine. I have used it in rough water recently, and had no leakage but I can't say this is a machine I would used daily in the surf, but then again, I'm not someone that could regularly hunt rough water daily either.
My GT had to go, it hadn't been out in a year, the Excals have only been used as backups with the exception of when I got the blue, I wanted to see it get gold, it did and it now sits.....if this continues, next year, the Excals will go and I'll have a backup CTX unless someone comes out with a better water machine,
Cliff