They have free worldwide shipping and solid customer service - as well as a nice line of diffusers. I accidentally left them off my original list but they are just as good as the other 2 nebulizing diffuser companies I listed previously.
I have been looking at cold air diffusers and the ones you mention are only available in USA/Canada (I think, although I may not have looked enough). I think actually I can get one of them through ebay uk but the shipping and import costs make it quite costly.
This one is available from Amazon UK and I would be grateful for your opinion on it: