I did. The dresses were fab, but not as cheap as you would think. The delivery charge was quite high, more than the younger girls dresses!
I ordered mine in December and they were delivered quickly, I think about 3 weeks. But last week (so 2 months later) I had an invoice from DHL who had delivered them for £60 import tax as they ahdnt declared the item as a 'gift' to dodge the tax.
I think (including delivery and tax) I paid around £110 for the adult BM dress, and £80 for the younger BM dresses (5 in total) so not quite as cheap as th website suggests. I think the basic price of the younger BM dresses were £32.
Having said that, the dresses are lovely, you can choose whatever colour you want and customise how you want. I had mine made to measure, and they were delivered very quickly. I didnt have time to order them from a bridal shop.
Just be prepared to pay more than the basic price that the website quotes.
ETA: I got my dress from yourbridalwear.com and that is lovely, and cost under £200 in total. I would defintiely recommend them.