It's like a vacuum cleaner for coins, and the battery life was amazing. I got almost 60 hrs out of a set, some of that with the backlight on low. I found the depth to be adequate, not Tejon-deep, but often as deep as I cared to dig. There is a lot of information on the screen, and I never found it to be too small. Then again, I'm just a young whipper-snapper compared to some of the people here.
For Canadian coins, all I looked for was the 95 to flash by on at least one swing. If I saw that, I dug. Zincs fell in the 80's so I could ignore those when I got tired of digging. I dug $140 out of one schoolyard with the Cortes, and watching for the 95. Personally, I hate having to memorize a bunch of numbers, so having just one to remember was great.
On the negative side, I never really "got" the SUM mode. Hold the button and swing with small arcs back and forth a bunch of times until the tone settles. I think that's the just of it. In that time, I could just dig it up and see what's there. I wish the tones were on full time, and maybe not quite as many. 4 tones like the Golden seems right to me.
To make a long story short, I think the Cortes is an awesome machine in the $400-$500 range. For the full retail price, there are better solutions. I love Tesoros, and will never part with my Tejon, but I think the ID machines are best left to the other companies that are good at it. I would love to see Tesoro stick with the "beep and dig" machines, but come out with more tone machines like the Golden