If you live the EL/EPEL world and have some Fedora, SC make a lot of sense. If you only use Fedora, Fedora moves fast enough to likely not have a ton of use for them. I think that's been hit.
As for Puppet, I've proposed several ideas on how to improve Puppet on Fedora/EPEL and basically it turned into a bitch-fest. I'm still working a plan on it. When a distro chooses "First" as one of their foundations, that comes with problems. Fedora is the first (and only of the 8 major Linux distros we support) to only have Ruby 1.9 support. We have a puppet that fully supports Ruby 1.9. It didn't make it into Fedora 17. I've been working hard to see if it's possible for F18.
I could get into more discussion on Puppet with EPEL/Fedora, but that's been covered.
Back to software collections: I'm in favor for EL. On Fedora, meh. In fact some of CentOS people have already spoken with Puppet Labs about maybe doing something with SCs for EL if needed.
(Obvious disclaimer, I work at Puppet Labs)
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