Lots of aluminum blocks out there, most production vehicles are going to aluminum blocks and if Detroit is embracing it then there's a reason especially since it's more expensive than cast iron.
Pro - major one is less front-end weight.
Con - coolant erosion, watch your coolant choices.
Well actually there is one other con with aluminum, makes your magnetic dial indicator base pretty useless. (as does stainless)
You can screw anything up with enough neglect as McD00 pointed out.
