Hi,
I don't know them personally, but this speaker got a very favourable review on the german website areadvd.de (http://www.areadvd.de/hardware/2010/quadral_argentum_390_370.shtml). Quadral is known for their excellent tweeter. However the best advice I can give you is to go out and find a shop that has a pair and decide for yourself if it's your cup of tea.