Skillet, the 750 is a really decent machine. Used one for years as my main detector, with the regular coil, the small search coil and big old pizza pan coil for the deep, deep stuff. Found lots and lots of stuff, a 300 year old fur trade axe head, lots of old, old coins, military buttons, musket balls, you name it, I have boxes of the stuff packed away, and some pretty nice finds among them.
The 750 is fairly light to lug around, good discrimination, pretty accurate id (as far as id's go), dead accurate pinpoint (it''ll drill a hole through the centre of a dime). It tends to think rusty old square nails are silver, but I can live with that,,, when you're digging old square nails, you know you're digging in the right place. As ole Bill Revis used to say on the forums, the only way to tell treasure from trash is to dig it! As far as depth readings, if the 750 tells you it is a coin sized object at 6", it will be a coin at 6"... or a .177 pellet on the surface... or big old rusty chunk of metal at 14".... only the shovel knows for sure, ha!
In the last couple years, I upgraded to the 2500 for the "actual size, actual depth" feature and for the deep seeking non-motion deep seeking mode.. A great machine by any standards, but think it has made me lazy, cherry picking coin sized, good ringing targets, which admittedly has produced some nice coins but not near the volume of interesting goodies that the 750 sniffed out for me.
Best of luck. A fine machine that you can't go wrong with it.