I had a Cortes a few years back. It is a fun machine to use, but be aware that the GB doesn't apply in disc mode. It only is effective in AM. That's it's one "Achilles heal". I found mine to be fairly deep, much more so than the Golden uMax I had at the time. The digital readout is fairly small and I found it sometimes difficult to see with sun glare. I didn't find the SUM mode to be very useful, but I've read about some people who really liked it. All and all, it was a very enjoyable machine to use. I shouldn't have sold it.
Would I buy another? Probably not, at least not new. Don't get me wrong, I love Tesoros. But when it comes to machines with a display, I believe that the Cortes is over-priced for what you get. For $729 there are a lot of choices in the category of TID machines. An F5 is a great machine and is a lot cheaper. The new MX5 can be had for $499!! Heck, you can get an F70 for less! I wouldn't suggest any of the Teknetics machines (other than the T2) because of what I believe to be inferior build quality. I had an Omega and it was so flimsy that I wouldn't expect it to last long under normal use. Maybe I'm just spoiled with Tesoro build quality??
I hope the new machine(s) coming out in 2014 are not screen machines. I hope it's more along the lines of the Outlaw, but maybe in a waterproof housing and with 2 tone (ferrous/non-ferrous).