Hi blacappuccino, welcome to InfiniteMac forum.

You have really great chances to run mac os smoothly on both of your laptops. Not sure right now about all the components like network/wifi/etc but it general it should run pretty smooth. First of all, what Leo4All version did you try to install? Was it leo4all v3 (mac os 10.5.2) or newer one? Blocked apple logo on the screen means kernel panic, but no reason for a real panic, you probably selected something that you shouldn't.