> The fancy metal case isnt properly grounded- I get occasionally a slight tingling /shock from it when I have it plugged in.

There have been other comments about this, but to make it clear: It's the charger that's not grounded. You will see this effect with every other laptop / charger on the market which has no ground connection in the wall socket. It comes from y capacitors [1] in the switch-mode-power-supply.

[1] http://www.vicorpower.com/resource-library/articles/back-to-...