[Galaxy S I9000 General] tameracingdriver:
I've directly compared this screen with the HTC Desire (both AMOLED and SLCD), the HTC HD2 and the iPhone 3G & 4.

For me, its definitely up there, but I kind of agree with you on the text, when zoomed out it's not that great. That said I disagree that the iPhone 3G is better on readability - the SGS definitely is better. It's only not that great when compared with an LCD of an equivalent resolution. The HD2, Desire SLCD and especially iPhone 4 (which is stunningly sharp for text). However, its better than the Desire AMOLED.

For general UI use, I'd put both Desires and the HD2 behind the SGS and iPhone.... on the whole between the SGS and iP4 I'd say it was a draw, with both looking very sharp, clear, and colourful - the SGS is more colourful, and larger, but the iP4 is simply sharper.

For viewing pictures and movies, the SGS is clearly the best, with the best constrast, subjective detail levels and plain looks the most impressive. EVERYONE has commented on how good it looks for this. On the iP4, this is its weakness - its small screen, almost-square aspect ratio and slightly duller colours make it far less impressive looking than any of the others.

I'd rank them as thus:-

=1 - SGS

=1 - iPhone 4

3 - HD2

4 - Desire SLCD

5 - Desire AMOLED

The lags are disappointing IMO. With JM2, and the internal SD fix (cant even remember the name as there are that many fixes now), it was clearly better than stock, however not all animations are smooth, and there is a definite lag at times, seemingly fairly randomly too.

However, I've largely fixed that... some people seem to doubt autokiller, however, I can say it works for me - I set to strict or aggressive for the best results. I don't know why it works, and I can't argue against those that say it makes things worse, on paper at least, but my experience is different, it DEFINITELY helps.

Also, oddly, turning the GUI animations off too has made a significant difference. I still have the Launcher Pro animations (app drawer and pinch home screen view), and the gallery is still animated, but other GUI animations are disabled, and its a lot snappier, and I dont really miss it.

Now the only lag I get is the browser lag as in the link below, but even then Nicolocopus suggests a later firmware may fix it.

http://xdaforums.com/showthread.php?t=764070&highlight=browser+lag

Battery - the biggest drain IME is the 3G data connection. Make sure when you're in a place with wifi to leave wifi on over the 3G data connection. Make sure the phone isn't set to send the wifi to sleep (wifi sleep policy IIRC) as the data connection will kick in while the phone is asleep. Other than that, some drain through the course of a day is par for the course.

The other thing is the screen, turning down to minimum brightness is actually more than bright enough for indoor use, and seems to make a difference.

As for Launcherpro / Touchwiz, AFAIK once you set LauncherPro as default and then restart your phone, the home screen portion of Touchwiz (TWLauncher) is no longer running. You wont be able to get rid of TW completely unless a custom Vanilla ROM is made. Not all of it is THAT bad though, really.

Cant comment other than to say, I dont know about this, so many different "opinions" fly around - all I can say is Samsung advertised it as 512mb RAM, so I think they'd be pretty stupid to give you a phone with LESS RAM than advertised - but you never know, I guess.