Line 6 shot themselves in the foot w/ POD HD - I'm so happy with that thing that I'm no longer in the market for any such thing. :P Looks cool, though.
I do have a Spider 75 which I haven't used in a while, and I still have my old POD 2 - neither of which I plan on getting rid of though I don't use them.
One of my buddies has the DT and absolutely loves that thing - even if he also has access to lots of amps that the DT emulates. The DT is his main thing now.
Me, I really don't play loud - the minute I start loosing just a tiny bit of definition in what I can ear, I roll back the volume knob. Most amps are way too loud for my taste, the ones I'd like are, anyway. Or then they come with smaller speakers, which I'm not always happy with when recording.
So POD HD it is.