in fact, i have read a post saying that there is example that some poor adapter kill the Z
and when you buy a machine for several thousands HK$...why dont you buy a better adapter?
A cheap adapter isnt the same as a cheap lethercase which cannot damage your Z (ok, in most cases)
Therefore, I think a better adapter is worthwhile
try to imagine:
is there anyone who is willing to purchase two 6800GT graphic card(SLI), but buy a cheap power source for the computer?