This is a SGS thread, most users will support you to buy ; all hoping for Froyo. Being a Android user ( Nexus, HD2 on Android, Galaxy S  and Dell Streak ) these are my opinions, most probably will not be welcome by SGS owners:

1 : It improves the lagginess  and does NOT solve the problem and yes it still lag ocassionally. I have tried both Voodo and OCLF
2 : GPS - in a word it sucks - the worst I have ever used . Even my HD2 on Android beats it flat. No need to do any special settings on HD2. Dont even compare it with Nexus, Dell Streaks - both these will blow it out of the water
3. Your decision as is your money. Its positives - great beautiful display unmatch - I'd say it is better than iPhone 4. Great video options.

I have tried 2 Froyo roms ( all ibeta unofficial ) and I'd say brings some improvements but nothing amazing yet. The Quadrant score on the SGS is amazingly high - with lag fix I recorder 2150 versus figures of 1500 to 1700 for my other Androids but this figure is misleading as practically it fails miserably against the other phones I have

Of all the Android phones I have used this is my personal rating on a scale of 10 as best : Nexus One - 10, HD2 on Android 9, Dell Streak 8.5 and sadly Galaxy S : 5
This is of course just based on my personal needs and do not reflect other users

I will not advised you to do so. Get a proper Android phone instead. This is only for enthusiasts who has a HD2 and is fedup with WM 6.5. UNless you are the type who like to experiment

There are now about 20 Android  roms on HD2 available. Each one has its own bugs and whether is acceptable to you depends on your needs. I'd say since after end August most of the roms had overcome the major issue of not so smooth scrolling. Infact my HD2 on Android ( past 6 roms I tested ) the scrolling beats the Galaxy S flat, very smooth comparable to my Nexus. You need a good SD card at least class 4 as the rom executes out from the SD card.

It sometimes work, sometimes doesn't. Moody.

I just got the SGS.  there is a problem with the GPS locator?

paiseh...mine got the 3 button recovery mode..didnt knew this until now, God bless

erm it's a "!" in a triangle and an android beside it...There seems to be a selection of reboot system now, apply sdcard:update.zip, wipe data/factory reset/wipe cache partition...I dont know what to do now, cant exit recovery mode without rebooting it?

okay hold the power button already, phone restart...phew~~~~ almost heart attack...thanks a lot 

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i agree on your findings as my gps also behave the same, when put at wibdscreen never lost signal, gps very good but when i put somewhere else inside the car signal is not that reliable...

i think our gps is working well, only the signal is not that strong, i guess it's hardware issue rther than softwre issue

i tried it...it connects then after a few sec it disconnect and search for satelite again...keep repeat the same same process over and over again..cant seem to lock on the satelite properly

just now i run the gps testing...

indoor 4th floor - only 2 satellites
balcony 4th floor - up to 12 satellites

I heard Galaxy Tab launching in Malaysia tomorrow @ Sungei Wang.