Is there a case against ZFS?

Is there still a case against using ZFS in production?
I run Solaris servers and I am planning an upgrade to Solaris 10 10/09 from an earlier release.
Currently we use SVM for local disks and our vendor's technology for SAN volume management. We are considering migrating most (if not all) of our storage to ZFS. We want to be able to use LiveUpgrade on snapshots, easy storage management (especially growing a LUN), fast resilvering etc.
Are there any "gotchas" that we should watch out for? We have a lot of Oracle databases. Is that an issue? Has any of you had negative experiences doing what we are thinking of?

We currently have zfs in production for our app servers zones (hundreds of users) and it works great, we are currently testing it with a development oracle 10 DB and it till now (4 months) we had no problems. Please check http://www.solarisinternals.com/wiki/index.php/ZFS_for_Databases

expecially: "match the ZFS recordsize to the Oracle db_block_size"

We have a 96TB ZFS setup on an (clustered) Sun Storage 7410 unified storage appliance with multiple(8x) 10GBit/s links. It uses ZFS and OpenSolaris. This box rocks!

In our shop, we're still waiting. However, our usage is database mainly and it is very picky about filesystem and we'd rather see someone else spend hours and days testing and tuning as we don't have much resources (small shop).

At home, I'm using it, but it's a normal fileserver, not really using all the possibilities.