I got my MBP-Retina yesterday. Great piece of hardware though. But it's de facto unsusable! I really don't know what the engineers were thinking while designing it. But without the possibility to secure it it's worthless. As photog I need it in the field and on rock festivals you need it unattended in the press room (mostly tents).
And: I don't buy a slim laptop just to buy some stupid plates or cases that I have to carry around which make the laptop fat and heavy again. I mean I'm really angry about this but I think I have to return it and buy some mobile laptop that can be secured (and I won't buy a MBP with older hardware).
In general I know that for most companies it's mandatory that a laptop has to be secured in the office (at least at my company).
I think Apple did a big mistake to remove the lock because for many this is a no go!