I bought the Seios for the money and I was upset. They are loud, they shatter on startup, and you have to raise them and get a little air in them to astart sometimes. I was constantly messing with them. I think they are worth the money they charge, but it is not up to my standards.
You get what you pay for is completely true in this hobby. Everyone on this board has had to buy something twice cause they went with junk to save a buck somewhere along the way.
I never owned a tunze and it kills be to pay that much, but at least I know what I am getting