They bought Thompson sub machine guns in as large a quantity as they could get (or afford), but it wasn't nearly enough. In desperation, they turned to Maj. Reginald V. Shepherd and draftsman Harold Turpin, who designed this dandy little gun at the Royal Armory at Enfield. Their initials (S and T) along with the first two from Enfield (EN) gave the gun its name.
It was the opposite of the Thompson, which was nose bleedingly expensive due to the extensive machining required in its manufacture. With only 47 separate parts, Shepherd's and Turpin's gun was made out of stamped steel, with almost no machining required and only a little welding. Basically any metal shop in the realm could knock the STEN out, and they were cheap as chips - the first ones only cost 15 shillings - maybe $10 in 1940s money.
As you'd imagine, it was butt ugly. Nothing but stamped metal, a handgrip that's, well, unique (although not uncomfortable), and a pipe stock instead of the "shoulder thing that goes up".
I'm not any kind of gun or shooting expert. I like shooting, and shoot a fair number of different guns, but I'm really a dilettante. Your mileage may vary, void where prohibited, do not remove tag under penalty of law.
I don't do scientific, repeatable tests. There's no checklist, although that's not a bad idea. I write about what I like and don't like, but it's pretty much stream of consciousness. Opinion, we got opinion here. Step right up.
I'm not a shooting teacher, although I do like to introduce people to shooting.Maybe some day I'll take the NRA teaching class, but until then, you get a dilettante's view. You'll get opinion here, but if you get serious about shooting, you'll want to get someone who knows what he's doing to give you some pointers. It can help.
And oh yeah, shooting things is fun.