What's your favorite e-reader? Kindle, Nook, Playbook or ?

With Christmas coming and a convenient Dec. 7 birthday, the holiday sales are giving me a severe case of e-reader envy. I have an Adobe-based reader, which is not bad, but the battery doesn't seem to last long enough and takes for-ev-er to charge....

Having looked at a Blackberry Playbook (16gb) on sale for half it's original price (now $199) I admit I was hooked. How cool... then I started looking around, and the one drawback - that it only will download Kobo ebooks - and then you can't read others from other sources - has kind of soured me on that for e-reading. Cool that it has a camera, but I have a good camera for my writing purposes...

Nook Color looks pretty cool, especially since, as I've read, the SD card will expand it into a tablet-like device.

And then there's Kindle, too...

Decisions, decisions.... so figured I'd see what everyone else is using....

What's your favorite e-reader model, and why? How do you use it? Any drawbacks?