HELLO.....I THINK THE SST IS JUST A REWORKED MXT.....WHITES ,LIKE ALL DETECTOR COMPANYS ARE WORKING TO COME UP WITH FRESH IDEAS AND NEW MODELS...WITHOUT SPENDING ANY MONEY IN THE RESEARCH AND DEVELOPEMENT AREA....THINK OF A METAL DETECTOR AS A DIGITAL CAMERA...THE CAMERA PEOPLE COULD GIVE YOU A 100 MEGAPIXEL CAMERA RIGHT NOW,BUT THEY WONT...THEY INCREASE THE PIXEL RATING BY 1 OR 2 OVER LONG PERIODS OF TIME, SO THEY CAN VACUUM THE POCKETS OF ANYONE WHO WANTS A CAMERA....ITS SAD THAT YOU CANNOT BUY A PRODUCT THAT IS THE BEST IT CAN BE BECAUSE OF THE MONEY TO BE MADE OVER THE LONG RUN... WITH METAL DETECTORS, MOST TIMES THE ONLY CHANGE IN THE MODELS IS THE DECAL ON THE OUTSIDE OF THE HOUSING...I HAD A GARRETT MASTER HUNTER 7 AND A 10 AND HAD THEM BOTH APART SEVERAL TIMES AND THERE WAS NO DIFFERENCE WHAT SO EVER....REMEMBER A FEW YEARS AGO WHEN WHITES AND GARRETT HAD TO PAY MILLIONS OF DOLLARS TO MINELAB FOR SOME OF THEIR TECNOLOGY SO THEY COULD REMAIN IN BUSINESS...THIS IS BECAUSE THEY SAT ON THEIR HANDS AND KEPT SELLING TE SAME OLD DETECTORS IN A DIFFERENT BOX FOR 20 YEARS OR MORE...THERE ARE ONLY 2 TYPES OF METAL I CAN THINK OF,,,FEROUS AND NON FERROUS....THE PERFECT DETECTOR SHOULD ONLY HAVE ONE KNOB,,AN ON AND OFF SWITCTH.... THERE SHOULD BE ONBOARD.M ICRO PROCCESSORS THAT CONTROLL EVERYTHING,WITH ONLY ONE SOUND AND NO SCREEN,,,WHEN IT HITS A TARGET, YOU DIG. IT UP.....WHO CARES IF YOU FIND IRON,,ARE YOU GOING TO LEAVE ''BILY THE KIDS'' SIX GUN BEHIND JUST TO FIND THAT SILVER QUARTER????