Funny, despite all the glowing reviews, I have a Samsung Galaxy S (the original), and I hate it. I swore I'd never buy another Samsung product, nor another Android-based phone because of it.
The only way to get any decent performance out of it (and I mean, basic performance like mp3s not skipping) was to root it and format the file system. Then remove a bunch of crap samsung and my carrier put on it (Smartone actually put a porn app on there). They were extremely slow to make Android releases available for it (2.3 came out like 6+ months later). Now some apps won't install because the Market limit was raised to 50mg, but this phone only supports 25mb download. And, while trying to upgrade the phone twice, using the official (crap) software, it's bricked (At least the local samsung office was quick/effective at repairing it).
My point? To both Samsung and Android, the market is too hot, and there's someone too successful (Apple) to be messing around with your brands. It's a commodity market, there's simply too much choice not to have a solid product.