Samsung was the first 'tier 1' hardware manufacturer to offer some legitimate competition to the Apple iPad in our opinion. According to the Korean Herald, they've sold 600,000 units globally in the first month of availability. I wouldn't quite call that a smashing success, but I would go so far as to say that sales were brisk and probably exceeded the expectations of a lot of people out there.
Samsung was very smart in the fact that they put all the hardware necessary to work on almost every carrier out there. You can get a Verizon version, an AT&T version, a Sprint version and a T-Mobile version. Then there are all the overseas carriers that it will work with as well.
We have our very own Samsung Galaxy Tab section here on Droidforums.net -- so you can visit that here: Samsung Galaxy Tab - Droid Forum - Verizon Droid & the Motorola Droid Forum
Also, don't forget - we have a full site dedicated to all the different Android Tablets out there at the Android Tablet Forum - and a full section for the Samsung Galaxy Tab there as well: Samsung Galaxy Tab Forum