QUOTE(kmrdeva @ May 13 2011, 12:58 PM)
Best to do so, although many reported no problems going to overcome 2.0 after loading stock gingerbread firmware. Mind you, doing the GB-stock-safe method will wipe your internal SD (e.g. where your TitaniumBackup data is stored) so do backup to PC or external SD first, then remove the external SD while flashing.

Update : Have installed overcome 2.0 beta2. My gawd, it's smooth!!! Still loses to my CM7 on the SGS, though, ha ha. No time to run Quadrant yet, will update my forum sig later today.
Yup, as you've correctly pointed out, it'll be best to do the whole restock route, as from the many feedback we're getting, there's still some niggling but minor "leftover" glitches here and there going from the stock GB firmware. Don't misconstrue it to mean that you can't do a stock GB to Overcome 2.x, but best practice would be to have a cleaner slate by doing the restock route, according to the guide.
It's inherently faster and very well optimised, despite the RFS file-system found within. One irony is that, you'll encounter a very much lower Quadrant/other synthetic benchmark scores compared to the older much-optimised FroYo-based Overcome 1.x, which is attributable, we believe, to the RFS FS. This is one clear example, that synthetic benchmarks aren't the end-all when it comes to measuring a device and the experience it provides. Before pre-release battery of tests we've conducted, at best Quadrant gave me only 1,200! If you were to take the scores as the gospel truth, you'd think that the Gingerbread base is slow as molasses, but using it in real-life, it's definitely not so, right? ;-)
Well, here's a quick perspective: Yup, the Gingerbread base that Samsung has provided, is indeed a superb foundation to build on. Right now, what you're seeing is still based on the default kernel Samsung gave us, with not much optimisations yet! You can be sure, once the kernel sources are released, you can be sure the devs out there would be pimpin' their magic onto those customised kernels! Remember the early days when the 1.x Overcome Kernels/ROMs were only providing us about 1,400-1,600 Quadrant scores? Now, at the stock 1.0Ghz clock-speeds, the 1.x are easily breaking the 2,000 barrier! :-)
Bright future indeed...
Samsung definitely is improving their software back-end... kudos to them!