It isn't hard to use an optimus card with Debian or most other distros nowadays you just need to install bumblebee (wheezy-backports for debian) with that you get improved battery life.
I personally don't get GPU drivers breaking the computer but I don't use nvidias drivers I use nouveau but I also use Debian so a distro like Arch (which is more prone to packages breaking systems) might be much worse.
Sorry - I didn't see this comment. I'm running Debian Sid. I believe that have the Nvidia card disabled (in the BIOS). I haven't had a single issue with my Drivers.
I'm in the middle of trying to decide between Lenovo and Apple too.