I have never used the Tejon, but I do have a Sovereign GT with a WOT and it is a fantastic machine.
A couple weeks ago I found a Canadian Dollar coin about 6-8 inches deep under about a foot of water at Daytona Beach . It gave a loud solid tone when I found it, no doubt about it being there.
I have NOT had one single problem with the switches on my Sovereign, have used it a lot since I got it in early June 07. Not had a single problem with Sov GT at all, have found silver rings, gold rings, and a diamond ring so far with mine.
I have 2 Excal 1000s, a Whites 6000 XL Pro, Fisher 1235 X and the Sovereign GT and the Sovereign GT is my favorite for hunting, especially at the beach, As long as I am not in the surf I use it, but it isn't water proof.
Just my personal opinion.........
Good luck and good hunting.....................