The B450 range has an "owners' thread" here:
http://www.avforums.com/forums/lcd-televisions/971872-samsung-b450-owners-thread.html
A glowing review:
Samsung LE32B450 / LE32B450C / LE32B450C4W Review
Another review, of the 26" version:
Samsung LE26B450 TV review - from the experts at whathifi.com
I bought an LE32B450C4W on Monday (to replace my old LE26R73BDX, which was sent for repair & then "lost"
). [Still, the extended warranty / insurance paid for the replacement, & it's bigger & better than what I had before so it worked out good in the end]
I've got an Xbox 360 connected to HDMI 1 (initially used VGA), PS3 to HDMI 2, & Sky+HD to HDMI 3.
Still playing around with the settings, but so far I am impressed.
Had a session on the 360 last night, playing Halo 3 ODST, and it looked great. No noticeable input lag or ghosting.
Not played any games on it via the PS3 yet (although I'll be playing Uncharted 2 soon), but divx/xvid videos streamed from the PC to the PS3 look great.
I tried out the Terminator 2 BD too, and the TV did a good job (in my eyes) of taking the PS3's 1080p24 output.
Sky+HD looks good, although I need to fiddle a bit more to get skin tones looking more normal.
The sound is admittedly weak, although I'm used to that with Samsungs given that I had an LE26R73 before this new TV. Still, I just turn it up, or use an AV receiver.