I am a big steepandcheap fan. It fits into the "flash deals" category that woot.com first pioneered, except unlike woot, steepandcheap rotates it's deals throughout the day (woot is just one deal a day except during their "woot-offs"). This style of shopping is not for everyone as it requires a bit of luck and a lot of patience to find something on steepandcheap that you actually fits your needs. Clothing can be particularly tough to find deals on because often the size/color you want will be sold out by the time you check the site. Because of this I often wind up buying more equipment than clothing from steepandcheap (headlamps, ice axe, etc). Whenever you do find something that fits your needs you're pretty much guaranteed to be getting it for the best price on the web (and often the best price by a wide margin).
The checkout flow is fantastic. Once you're a logged in member of steepandcheap making purchases is extremely simple and hassle free. Also, this is one of the easiest sites I've ever dealt with for returns.
I was going to give a 3/4 rather than 4/4because of the slight hassle intrinsic to a flash deal site. However, they're not trying to be anything other than a flash deals site, so comparing steepandcheap to other sites in the same category I think it easily merits a 4/4 rating.