I had a set of these. I bought them from Hong Kong ebay. But by buying through their web they give you another 15% off; brilliant!!! (RC-Mall). Lets say I have also had the other umbro brands and not a difference except for the price.
You could say support your local, I did, I don't think there are many LiPo brands I haven't bought tried and tested. Robitronics are my favourite, but they happen to be in a car that's going well for me at the mo
Biased my opinion maybe.