That said, ZFS sounds great, and I've been meaning to learn it sometime. The big thing holding me off has been just -- well, how much time I've put into learning md and such, and how I would find it hard to justify going back to not knowing much (since this is my livelihood).
If you have any tips on "read this, it's a good intro" stuff (slanted to Linux, as that's my cuppa), I'd welcome them.
I will say that ZFS felt very coherent and even - dare I say it - easy. I was worried that merging layers that I'm used to thinking of as separate would mean a loss of control, but I was able to put together all the layouts I wanted. The various commands with a single interface felt a lot like using lvm2 - different tools but under a unifying structure with the same parameters - and a lot of what it does is lvm-like. So my best tip is to approach it more as an LVM that can also do raid-like functionality and be mounted directly, rather than as a raid system that includes volume management.
Sorry if that's not terribly helpful - as I said, I'm not an expert, but I wanted to at least give you some kind of reply.