I have a 3030 and an Excal. I wouldn't give up one for the other or live w/o either. Yesterday with the CTX and 17" coil in the wet I dug up the HEAD of the rivet on the back of button (if you know how little that is) 20" down. Utterly worthless but I was amazed... With the Exal and 15" WOT, I've dug bobby pins nearly 22" down....
If the machine you have produces and you know how to operate it why get something else? Only reason I have two is because I use one as a backup in case one goes out for repairs.
I hunted ALL summer long and only got 3 gold rings. A storm comes into town and I pulled 5 in 3 days. Then just as fast as they appeared, the beach re-sanded and it was all gone again...

We pay SO much attn to the depth game and which machine is better by an inch than the next that we forget about learning tide times, wind directions, current flow, etc. Those are much MUCH more important.
I say keep your Excal, get a backup and mix up your current hunting style.... I won't disclose how I did it but by changing it up I'm starting to FINALLY produce.