--- On Tue, 18/8/09, Kenneth Marshall <ktm at rice.edu> wrote:

> I am currently in the middle of upgrading our database
> backends from PostgreSQL 8.3 to 8.4. I would like to
> use Slony1 to keep the service outage to a minimum and
> have been waiting for the release of 1.2.17. Do you
> have an update on its release? Is the 1.2.17-rc stable
> enough to use for this purpose? I would appreciate any
> information that you have to share.
> 

I'm guessing they're just leaving a little time for people to test and give feedback about '17-rc

Just yesterday I replicated a test instance of our environment from 8.3 to 8.4, I've yet to do any more real day to day operation tests. 

If you're using it purely for upgrade, I think it's pretty safe to say you'll be ok.