If you use the leaked 2.2 you will not keep your root. You will have to reroot and it's not a one click method.Anyway, I'm trying to decide between the leaked 2.2 and the cognition 2.2. Though I've read through most of the posts in this and other Froyo threads, it's still unclear to me
1. Whether my phone will remain rooted if I go with the leaked version
2. Whether I can use a 1-click rooter if I install the leaked 2.2
3. Whether there are any benefits above lag-fixes (which I do not want) with going the Cognition route.
DW
As of last night there is not a 1-click rooter for the leaked 2.2 for the Captivate that I am aware of.
Going to Cognition 2.2 Beta from 2.1 gives you root basically. It also gives you Bluez bluetooth stack (no idea what this is) the stock battery with percentage (I love this) and that's pretty much all I can think of. It's really easy to do though.
I wouldn't use the OCLF in 2.2 as some people, including me have had issues with it. I had to flash back to 2.1 and then back to Cognition 2.2 Beta to fix it.
You can use Titanium Backup to restore your apps and data but some people have reported problems with this as well.
You cannot use Rom Manager once you're in 2.2 to flash to something else or backup.