[Vibrant General] Hung0702:
This is a terribly inaccurate, uninformed, and unqualified comment. The 2.2 ROMs are solid and the 2.2.1 ROMs are lacking because everyone is focusing on 2.3. The same can't be said for the 4G.

The 4G will have to compete with phones that possess superior hardware at the same or a slightly higher price. It will have significantly smaller adoption compared to the Vibrant. At the time of the T959's release, it was too good to be true. Everyone and their mother jumped on board because it had the fastest internals of any phone and best general purpose screen of any Android device. You're going to see a much larger T959 community, without a doubt, and the custom ROMs have proven to be better and as, if not more stable than the stock releases.

Further, the 4G is not a simple addition, but a tradeoff. You lose 1900 3G, which means you have no chance of using 3G on AT&T. I do, and being an unlocked phone, I take advantage of AT&T's $10 data plan (requires $30 unlimited family messaging) and have used at least 3GB/month since September. If you're are stuck with Tmo, positively certain that you won't/can't switch, this may be unimportant. To new, it's not worth a negligible increase in speed. On AT&T in Atlanta, I get 400 KB/s typical and 300 KB/s during peak hours (3.2 and 2.4 mbps for those who think that's slow). How fast is Tmo's 4G going yo be? 500 KB/s? You might notice that kind of difference, I don't even notice the difference between 400 and 300 KB/s.

Video-calling doesn't look like it will become popular soon, perhaps via Skype, but that front-facing camera seems probably won't get that much use. You'll probably be on a new phone in 2 years anyway, and that's a VERY optimistic timeline. Vchatting probably will noy become popular on mobiles (I mean 1 mobile vchat/week) for several years. Regardless, you can scrap together $30 bucks and get your own FFC from a many sites. Very simple self-install.

Regarding GPS, mine works perfectly, but it took a lot of tinkering to get it that way. This may seen daunting, undoing a few screws and gently bending up a piece of metal, but I haven't had an issue since. My LbsTestMode settings are MS based (uses network to assist GPS initial locking), hot start (requires a 10 min position test or similar on cold start) and auto SUPL (automagically fixed!). The while process takes less than half an hour. If I weren't a student, I'd be getting minimum wage and $4 isn't a huge time cost to get GPS that should have been working to begin with.

Another possible contention may be the chip yields on the 4G. This is a completely valid concern if you plan on overclocking/undervolting, otherwise, it's completely irrelevant. Samsung's fabrication process is likely VERY mature at this point, but it's hard to say whether or not the current T959s would be from the same batch as the 4Gs (they probably are). It also needs to be determined that the difference in yield would translate to poorer overclocks/undervolts. Actually, I presented a lot of good reasons this point is probably irrelevant.

Having read all that, it's up to you. Is 300KB/s (2.4 mbps) appreciably slower than Tmo's 4G implementation (i read that it's ~500KB/s, same latency)? Do you vchat on the go and without your laptop? Can you live with 12GB fewer internal memory? Took squeamish/lazy to fix your GPS? Are you absolutely sure that you will stay on Tmo? Most importantly, are you willing to give up a huge dev community for a nearly nonexistent one? Say 'yes' to more than a few of these and you'll probably be happier with the 4G.