Anything that has to be "jailbroken" or "unlocked" in order to be usable is not acceptable for me.

I learned that a hard way some time ago with a Kindle. Thankfully, I never did such mistake with mobile phone, as there I would suffer much more than I did when update patched a jailbreak vector and I was cut off from my Debian chroot installation on Kindle. Debian was a nice toy and it actually made the device much more usable for my usecase (for instance by allowing me to run an IM app).

Being used to openness of my GTA02, GTA04 and well, N900, switching them to anything like an iPhone would be a pure masochism for me - even when taking a jailbreak into consideration.

(and as I have a possibility to use a newest iPad a lot in my job, my experiences with it make me even more sure about that)

Breaking into my own piece of hardware feels really, really wrong.