Cheers
Yeah - guard psykers and space marine librarians have access to them. They perils on any double though, so aren't used as often. I've found the ability to throw down a rending daemonette unit that is strong against a lot of what my conscripts can't handle is really useful! I have a bunch of sinister-looking possessed guardsmen to represent them
Barrage spam does worry me - particularly wyverns or thunderfires. Foot orks really don't. I've never had a problems handling other hordes - anything that a lasgun can hurt is weak against this list haha.
The other bigger worries are multiple riptides/ghostkeels and light armour spam. I'd just have to rely on having enough bodies to score objectives at the end of the game.
And I'll let you know how it goes - as I said it won't be for a couple of months!