Critter - just my opinion but I believe you are being too paranoid!

I do have high hopes for the CTX3030 and expect to be an early adopter (although not before I see some reviews). In terms of VLF technology I suspect it may be an incremental improvement over over the E-trac. And in other ways it seems to have incremental improvements i.e. color screen, wireless headphones, and being waterproof to shallow depth. I really like the idea of it being waterproof. I also think the GPS feature, depending upon how they implement it, could be a nice bonus. While GPS is not yet accurate enough to retrace your exact steps, it could come in handy in the following scenarios, assuming these feature are supported:
1) Perform research on-line using something like Google maps. Locate promising areas to search and download coordinates into CTX3030. Now the GTX3030's GPS can be used to find the generalized location, at which point you can carefully grid the area.
2) When trying to grid a large area use the GPS tracking feature to mark what area you have covered. Granted you will still need to carefully grid becasue the GPS is not accurate enough to allow you to follow a grid-line, but it can mark off a general area, perhaps even allow you to upload your progress in a large field or beach to a computer for future reference.
3) Allow setting way-points where you have made a find. Perhaps the data can be uploaded to mapping/database software to allow for easy maintenance of a database of finds.
However since you can already do much of this with a portable GPS it is not really a game changer either. But when you put all of the incremental improvemetns on the CTX3030, it MIGHT turn out to be quite a nice machine.