You can make specific requests of course but mostly the system seems geared towards blokes who can't be bothered signing up and hitting the "I'd like some decent clothes please" button. They deliver them, you try them on, decide what you like and what you don't. They pick the rest up and then charge you for the stuff you've kept. It sounds very simple, and of course you can specify stuff you like and stuff you don't - I've asked for "no jeans" for reasons that will become apparent very quickly to regular readers (he says, mysteriously).
They take your sizes, your preferences - I opted for "casual/weekend", ignored "edgy" for example - you say which colours you like and what styles you like wearing. You also set a budget and they're quite frank that the cheaper stuff isn't their market; anyone wanting trousers for under £75 will need to shop elsewhere.
So I'm just waiting for my first box to turn up. It might contain stuff from APC, Bertie, Diesel, Gant, Paul Smith, Reiss, many such designer brands.
Reasons I think it might work: I rarely have the time to go out and look at shops. And when I do I often find my wife has a better eye for what's going to suit me than I do. The convenience and the ability to ask her what she thinks at leisure could get me some very nice pieces.
Reasons I think it might not work: The idea of just getting "some clothes" bothers me a little. Many people will be a little more specific than that in their needs. Or a lot.
I'll let you know how I get on.