Ypsilon sound phenomenal on the Thiels, ultra refined sound without any harshness, very emotional.I'm sure Aries Cerat monos will be at least at the same level if not better.Regarding Swiss brands CH Precision is the only one i'm considering, the smoothest and tubey of the Swiss SS brands.It's also the most expensive brand of them all therefore my dealer better give me a good discount if i go this route.