One thing I noticed from those companies is that they all sell similar designs.I ordered them from Chinese ebay sellers. All the shells are the same and they all come from the same place.
Over the last few years, I have bought several basic dresses for me and my DDs, from a number of Ebay sellers. All cost $30 in my mailbox ($5 bidding war plus $25 postage) - I can't even buy the fabric for that! They all had a swing tag marked Ice Fairy, no matter who was the listed Ebay seller.
First the good:
They were made to measurements, and the bodices were fully lined. Also, I was able to order them without crystals, which was good as their crystals are not high quality.
I discovered you could ask to change the colour to another colour in the seller's range (look at the seller's Ebay shop to see their colours). I'm not sure if they still do this, so if you want a different colour, you should check with them first before committing to buy.
Now the less good:
The briefs of the dresses were an odd shape - it was almost impossible to tell which was the front and which was the back. I ended up recutting and re-elasticating the briefs of the adult size dress I bought. They may have changed their shape in the couple of years since I bought one.
In relation to fabric & colour choices, they weren't very good at matching chiffon to lycra or velvet, particularly to velvet. Black was OK, but red, blue and purple velvet leotards had oddly matched chiffon skirts attached. I learned to ask them to make the skirt out of the same fabric as the leotard, and this eliminated the problem.