Sold my 16gb iPad 1 for $300 on ebay.
And I'm keeping the tab 10.1. I love it alot despite it being buggy.
Here are my impressions of the tab 10.1 coming from an iPad (for future switchers)
Hardware- It's very light and the plastic back makes it feel like you could crack it in half. I am still treating it with kid gloves compared to the heavier and aluminium backed iPad. Other than that, it is all on par with the the iPad. The automatic screen adjuster is wonky, so I turned it off. The screen is just as good, sound is just as good, etc. Battery life is not as good as the iPad though.
Android OS- Think of iOS as a base car with no fancy options. It does its job, is reliable, but is a little boring. iOS is just a grid of icons and more reliable than Honeycomb. Honeycomb is the same car but fully loaded- start-stop, keyless entry, 7-speed automatic transmission with 3 different settings and a set of paddle shifters, and a complex iDrive. There are more options, it's more fun to play with, you can customize things just the way you want, but it's gonna be more buggy and you're gonna be lost at times. Honeycomb has widgets, flash, a nicer youtube app, live wallpapers, all kinds of settings to tweak. But you get issues. My youtube app decided to crash for a few days before it started to work again. Same thing with one of my clock widgets. The Apple experience is all minimized for ease of use- there is a certain elegance to it all and the commands are intuitive. Android is not that. You will get be confused in the beginning, but you'll have so many more options to tweak and play with. Android is the more fun OS if you are into that sort of thing.
Android Market- I used to own a droid and one of the main reasons I left was the selection of apps stunk. It's improved, but don't expect the same options as iTunes. I saw this really cool stock market app on an iPad 2 in the Apple store and first thing I thought was, "nothing like this will be on Android..." Android Market does have one big thing going for it- emulators. From what I see, there is less of the heavy-handed policing like Apple.
Overall software experience- it is a lot more fun than the iPad- the widgets on that screen really make a difference compared to the grid of icons. There are a lot of options you can play with. Android is a more fun OS to play with. But it is buggy at times. Sometimes netflix will play the video out of sync with the audio. That's another issue. The calendar is better, google maps is better (duh), google finance is better, anything google is better. The biggest annoyance is that the on screen keyboard does not hide the notification bar at the bottom of the screen. So expect to hit the bar and not the space bar when typing. You have to move your fingers up a few milimeters. But the keyboard is just as good as the iPad once you get used to it.
Yes I know the tab 2 came out, but for the price I got it at, I love my tab 10.1 and I have no regrets switching. Even with the bugs. They are annoying and I do think back to the more reliable iOS, but it's not like the thing is shutting down or factory reseting when the sun is out. It's annoying. It is so cool to have widgets again. I love turning on my tab and on one screen, I can see the 5-day weather, the date, my calendar of the day's events, new emails, stock quotes. It's more efficient. I don't need to go from app to app to get everything and don't have a mystery number telling me I have 3 new messages. I know what my messages are. And the notification bar is better. I hate the iOS notification bar. It flashes a brief message and if you forget it, there is no icon reminding you of it. I never use the damn thing on my iPhone 4.
For the record, I am not an Apple whore and I don't drink the kool-aid that the little green robot serves either. Both tablets are good- it all depends on what you like better.