I've used the iPad 1, iPad 2, Samsung Galaxy Tab 7" (2010?), Samsung Galaxy 9" (November 2011) for long periods of time.
The iPad is probably still my recommended tablet. The screen size, speed, display, etc. I only use tablets for reading newspapers, websites, fb, twitter, and various apps (i.e. no gaming) and I find it better then the Samsung Galaxy Tabs.
The nice thing re: Galaxy Tab is you can fit it in your jacket pocket since they are quite a bit smaller then the iPad.