Bought SGS Yesterday @ 28 K from Samsung Experience zone South Ex.
Was a bit anxious as many user have reported one or other issue with device
Initial Expression
Build Quality - Top Notch(far better then my old N81) Although plastic, but gives a firm feeling in hand
Performance - Phone works like a breeze, It easily handled anything I threw at it.
Graphics - A Super AMOLED screen with a dedicated GPU is a great combo.
Interface - Personally didn't like TW that much, Replaced with LauncherPro, few touches here and there, and I really like the UI now.
WiFi - Although it will not be justified to compare my Lappy with it, but WiFi reception is not as strong as my lappy. with my lappy I can get acceptable signals placed one floor above. With SGS cant, but 2-3 rooms away is Just fine.
GPS - Takes Some time to lock satellites while indoors, but out side works like a charm.
It was serious fun driving with Voice navigation (Thanks BRUT). But whole experiment costed 25 Rs, have not activated data plans yet.
About Kies - Many User have reported problems with s/w, but I have not faced any, connected very well with my lappy, Win 7(32 bit).
TV Out Function - Does the Job, Quality is just acceptable as we are using lowest std (RCA) to transfer content HDMI would have been boon. Although it was real fun to play Asphalt5 on big screen. amazing...
Here I would like to say something not about SGS or Desire or Nexus one but Android as a whole
I agree that Google is doing a remarkable job, but still there are few gaps in the OS, some really annoying.
Some are due to ignorance on the google's part and some coz of loose control over app.
market
I love to listen to local Radio Stations while driving my bike. During Ads I pushed accept call button on Headphone and expected radio to jump next station(Like Symbian, even Nokia 1650) but nothing happened, pushed again, same reasult, Pused longer and it started my Music player. I was like..... nevermind.
Again Radio Bug, I was happily listening radio and driving, a call came, I replied can ended, I expected radio to resume, but Guss what it didnt. again I was like ..... Nevermind
There is a app called Advanced Lock. It is supposed to replace our lock screen with slide to open (kind of iPhone) screen. The developer simply coded a logic that if display goes blank lock the screen. but he forgot to think that it may occur due to some other reasons like proximity sensor during call.
I simply dared to call to a IVRS with this app installed. every time I had to unlock screen to be able to dial a number.
Beside these small niggles I am really loving my phone.
I am very hopeful that with time Android will get better and better and we all will also feel proud that we also played a part in it.......
No Indian firmware update on samsung-firmwares.com. Only DDJF2 !!! That even without modem file !!! 
