I have bought a few things from there, and I have to say, so far I've been impressed.
I would support Sapphire's comment, that sizing is standard or slightly smaller, but even if something is slightly smaller it still fits. I haven't bought anything in my usual size that was so small, I had to sent it back, and get the size up.
I bought a printed t-shirt from there for about £8, and I said to myself, 'I bet the print fades after several washes, as it's so cheap'. Well it's been washed several times since and still looks as good as new.