Yes, I did.
Lost the ability to upgrade your computer yourself.
Wrong. I've already upgraded it myself. The CPU itself is a desktop HT CPU--not the puny Mobile M's with less power--and the OS sees it as an SMP machine.
Got a less stable environment. Heat still kills laptops like DDT does bugs. Good luck putting an extra fan in there.
Again, it's built for that--It came with two fans. I will grant that it does run a little warm, but I can live with that. It's never actually on my lap anyway.
I don't think they are worth the money and the lack of flexibility.
OK. That's fine. However, flexibility seems to be defined in the eye of the beholder. I can now compute anywhere I wish. I can plug into any network and be one my machine. I have more desk space, with no loud tower sitting around my feet, no extra keyboard, speakers, or huge CRT taking up desk space. No wires getting all tangled up.
To me, that's flexible.