I have been ordering from Next for a few years. Not once has the website let me down. The clothing is priced well, is of extremely good quality, and ships very fast - it took two days coming from the UK to Australia, which is amazing.
The only slight problem, which isn't the business' fault, is that sometimes the sizes tend to be a little big. If you're worried about this use the sizing guide or order a smaller size than usual.
One of the best online clothing websites I have ever ordered from - definitely check it out.