We use Miele at home. It's the best vacuum I've ever used. I am allergic to dust and this is the only brand I have tried that would not make me cough after each vacumm. It's very relible, too. Mine is 7 years old and I use it very week. I expect it can last for a long long time. People may think it's kind of expensive, but if you take into consideration of how long you can use it and how good the performance is, you will find it's really a good deal.
I think you can find their retail stores in Taiwan. You can first use google to find some information.