thanks a lot !
from what i've read on the net about King koil, seems like they're to be avoided !
i'm actually torn between Vono and 4-Star since Vono is from Slumberland BUT Slumberland is now owned by Malaysian company so Vono might be started by the company to make use of Slumberland's reputation without any real quality.
as for 4-Star, they seem to be quite low-tech, eh?
by the way, any bad concumer experiences with either brands ? i'm more concerned with durability rather than comfort.