As a couch surfer to browse the net or check email. or for media and/or games while in bed, on the train/plane, etc, it serves its purpose. Swag was right on the money when he said they are geared towards consumption rather than creation, and for that reason (amongst others), I am still holding off.
The ipad 2 is the only truly polished tablet atm, and it comes with a slew of tradeoffs (no flash, no microsd, no hdmi or usb unless you pay for a ridiciolously overpiced cable, and itunes).
The competition differ only on screen quality, ports and price, as the core experience will be more or less similar since they are all powered by tegra 2 and run honeycomb. RIM has taken a different direction with QNX and the OMAP 4430, but like the honeycomb tablets, is still a software update from living up to it's true potential in terms of functionality.
If I had to choose 1 right now, I would get a nook colour. It does all the basics for half the price, supports flash, and if apps are your thing, last time I checked it has access to them without rooting it.
I'm still holding off, at least until tegra 3, since I feel the price is still to high for what you get.