Hi. I'm bumping this thread.
I got my international version YP-G70 yesterday and it came with 2.2.2 (froyo).
The haptic feedback and vibration in general worked well.
I upgraded via Kies to 2.3.5 (gingebread) and the haptic feedback was gone. Alse there was no way to enable it under Settings/Sound.
So i flashed the Eryigit 2.3.6 custom rom and hoped the issue would be resolved, but sadly no. In the sound settings there is an option to enable/disable haptic feedback but it doesn't make any difference.
I feel the vibration motor behaves a bitt sluggisk too compared to 2.2.2.
Does anyone have some sort of workaround/solution to this?