Lucky for you that you had no disconnects. But getting those limits which files you can put on the external disk if you need them available all the time. E.g. when my external disk gets disconnected, EyeTV stops working as its work directory is no longer existant. Also, I don't see how having an additional large box (which by itself costs as much as many PCs) doesn't defeat the purpose of an all-in-one machine.

I am not arguing that the iMac shouldn't exist, I just listed a few points which can be better addressed with a proper desktop machine. Why I would be willing to spend quite a bit of money for that convenience.